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\bibitem[AdB]{AdB} M. Adams and M. Bergvelt. The Krichever map, vector
bundles over algebraic curves, and Heisenberg algebras. Comm. Math.
Phys. 154 (1993) 265-305. *

\bibitem[Al]{Al} E. Aldrovandi. Toda fields on Riemann surfaces: remarks 
on the Miura transformation. Q-alg 9508003. *

\bibitem[AlFa1]{AlFa1} E. Aldrovandi  and G. Falqui. Geometry of Higgs 
and Toda fields on Riemann surfaces. hep-th 93120?3. *

\bibitem[AlFa2]{AlFa2} E. Aldrovandi and G. Falqui. Toda field theory as 
a clue to the geometry of {\cal W_n}-gravity. Hep-th 9411184. *

\bibitem[AlBo]{AlBo} E. Aldrovandi and L. Bonora. Liouville and Toda 
field theories on Riemann surfaces. hep-th 9303064. *

\bibitem[ABMNV]{ABMNV} L. Alvarez-Gaum\'{e}, J.-B. Bost, G. Moore, P. 
Nelson and C. Vafa. Bosonization on higher genus Riemann urfaces. CMP 
112 3 (1987).

\bibitem[ADKP]{ADKP} E. Arbarello, C. DeConcini, V. Kac and C. Procesi.
Moduli spaces and representation theory. Comm. Math. Phys. 117 (1988)
1-36. *

\bibitem[AD]{AD} E. Arbarello and C. DeConcini. Abelian varieties,
$\infty$-dimensional Lie algebras and the heat equation. Proc. Symp.
Pure Math 53, 1-31.

\bibitem[BKK]{BKK} I. Bakas, B. Khesin and E. Kiritsis. The log of the 
derivative operator and higher spin algebras of {\cal W_\infty} type. 
CMP 151 2 (1993).

\bibitem[BaG]{BaG} V. Baranovsky and V. Ginzburg. Conjugacy classes in
loop groups and G-bundles on elliptic curves. alg-geom 9607008. *

\bibitem[Bea]{Bea} A. Beauville. Monodromie des syst\`emes
diff\'erentiels lin\'eaires \`a p\^oles simples sur la sph\`ere de
Riemann. Bourbaki 765 (1993).

\bibitem[B1]{linear} A. Beilinson. Coherent sheaves on $\Bbb P^n$ and
problems of linear algebra. Funct. Anal. Appl. 12 (1978) 214-216.

\bibitem[B2]{res} A. Beilinson. Residues and ad\`eles. Funct. Anal.
Appl. 1980.

\bibitem[B3]{ICM} A. Beilinson. Localization of representations of 
reductive
Lie algebras. Proc. ICM 1983. *

\bibitem[B4]{regulator} A. Beilinson. Higher regulators and values of
L-functions. Modern problems in math VINITI series 24 (1984) 181-238. *

\bibitem[B5]{absolute} A. Beilinson. Notes on absolute Hodge cohomology.
Comp. Math 55, 35-68.

\bibitem[B6]{height} A. Beilinson. Height pairings between algebraic
cycles. LNM 1289 (1987). *

\bibitem[B7]{derived} A. Beilinson. On the derived category of perverse 
sheaves.
LNM 1289 (1987). *

\bibitem[B8]{glue} A. Beilinson. How to glue perverse sheaves. LNM 1289
(1987). *

\bibitem[B9]{polylog} A. Beilinson. Polylogarithms and cyclotomic
elements. MIT preprint.

\bibitem[BB1]{BB1} A. Beilinson and J. Bernstein. Localisation de $\cal
g$-modules. CRAS 292 (1981), 15-18. *

\bibitem[BB2]{BB2} A. Beilinson and J. Bernstein. A generalization of a
theorem of Casselman. Utah conference on Representation Theory, April
1982. *

\bibitem[BB3]{BB3} A. Beilinson and J. Bernstein. A proof of Jantzen
Conjectures. I.M. Gelfand Seminar, eds. S. Gelfand and S. Gindikin.
Adv. Sov. Math. 16/1 (1993), 1-50. *

\bibitem[BBD]{BBD} A. Beilinson, J. Bernstein and P. Deligne. Faisceaux
Prevers. Ast{\`e}risque 100 (1982).

\bibitem[BD]{BD} A. Beilinson and P. Deligne. Interpretation motivique
de la conjecture de Zagier reliant polylogarithmes et r\'egulateurs.
Proc Symp Pure Math - Motives, 97-121.

\bibitem[BD1]{polydiff} A. Beilinson and V. Drinfeld. Affine Kac-Moody
Lie algebras and polydifferentials. IMRN 1994 1, 1-11. *

\bibitem[BD2]{opers} A. Beilinson and V. Drinfeld. Opers. Preprint. *

\bibitem[BD3]{chiral} A. Beilinson and V. Drinfeld. Chiral Algebras I.
Preprint 1995. *

\bibitem[BD4]{hecke} A. Beilinson and V. Drinfeld. Quantization of 
Hitchin's
Integrable System and Hecke Eigensheaves. *

\bibitem[BFM]{BFM} A. Beilinson, B. Feigin and B. Mazur. Introduction to
algebraic field theory on curves. Preprint. *

\bibitem[BG]{BGin} A. Beilinson and V. Ginzburg. Infinitesimal structure
of moduli spaces of G-bundles. Duke Math J. 4 (1992) 63-74. *

\bibitem[BGSc]{Koszul} A. Beilinson, V. Ginzburg and V. Schechtman.
Koszul duality. J. Geom. Phys. 5 (1988) 317-350.

\bibitem[BGso]{Kosz2} A. Beilinson, V. Ginzburg and W. Soergel. Koszul
duality patterns in representation theory. JAMS 1996. *

\bibitem[BGSV1]{BGSV1} A. Beilinson, A. Goncharov, V. Schechtman and A.
Varchenko. Projective geometry and K-theory. Alg. Anal. 2 (1990)/3,
78-131.

\bibitem[BGSV2]{BGSV2} A. Beilinson, A. Goncharov, V. Schechtman and A.
Varchenko. Aomoto dilogarithms, mixed Hodge structures and motivic
cohomology of pairs of triangles in the plane. Grothendieck Festschrift
I.

\bibitem[BK]{BK} A. Beilinson and D. Kazhdan. Flat projective
connection. Preprint (1991). *

\bibitem[BLM]{BLM} A. Beilinson, G. Lusztig and R. MacPherson. A
geometric setting for the quantum deformation of $GL_2$. Duke Math J. 61
(1990).

\bibitem[BMcS]{BMcS} A. Beilinson, R. MacPherson and V. Schechtman.
Notes on motivic cohomology. Duke Math J. 54 (1987) 679-710.

\bibitem[BM1]{BMPol} A. Beilinson and I. Manin. The Mumford form and the
Polyakov measure in string theory. Comm. Math.Phys. 107 (1986) 359-376.

\bibitem[BM2]{BMSel} A. Beilinson and I. Manin. Values of the Selberg
$\zeta$-function at integer points. Funk. Anal. i ego Pril. 21:1 (1987)
68-69 (in Russian).

\bibitem[BMS]{BMS} A. Beilinson, I. Manin and V. Schechtman. Sheaves of
the Virasoro and Neveu-Schwarz algebras. LNM 1289 (1987). *

\bibitem[BS]{BS} A. Beilinson and V. Schechtman. Determinant bundles and
Virasoro algebras. Comm. Math. Phys. 188 (1988) 651-701. *

\bibitem[BPZ]{BPZ} A. Belavin, A. Polyakov and A. Zamolodchikov. 
Infinite conformal symmetry in two-dimensional quantum field theory. 
Nuclear Physics B241 (1984) 333-380. *

\bibitem[Ber]{Ber} J. Bernstein. Sackler lectures. Q-alg 1994. *

\bibitem[BGG1]{BGG1} J. Bernstein, I. Gelfand and S. Gelfand. Category
of $\goth g$-modules. Funct. Anal. Appl. 10 (1976), 2.

\bibitem[BGG2]{BGG2} J. Bernstein, I. Gelfand and S. Gelfand. Schubert
cells and cohomology of the spaces G/P. Russian Math. Surveys. *

\bibitem[BGG3]{BGG3} J. Bernstein, I. Gelfand and S. Gelfand.
Differential operators on the base affine space and a study of $\goth
g$-modules. Lie groups and their representations, ed. I. M. Gelfand.
Halsted Press (1975), 21-64. *

\bibitem[BerOog]{BerOog} M. Bershadsky and H. Ooguri. Hidden sl(n) 
symmetry in conformal field theory. CMP 126 1 (1989).

\bibitem[Bloch]{Bloch} S. Bloch. The dilogarithm and extensions of Lie 
algebras. LNM 854. *

\bibitem[BCRS]{BCRS} L. Bonora, P. Cotta-Ramusino, M. Rinaldi and J. 
Stasheff. The evalutation map in field theory, $\sigma$-models and 
strings. I: CMP 112 (1987). II: CMP 114 3 (1988).

\bibitem[BPW]{BPW} Bolton, Pedit and Woodward. Minimal surfaces and the
affine Toda field model. J. Reine Ang. Math. 459 (1995) 119-150.

\bibitem[Bor]{Bor} R. Borcherds. Vertex algebras, Kac-Moody algebras and 
the Monster. Proc. Nat. Acad. Sci. USA 83 (1986) 3068-3071. *

\bibitem[BoMP]{BoMP} P. Bouwknegt, J. McCarthy and K. Pilch. Quantum 
group structure in the Fock space resolutions of \hat{sl_n} 
representations. CMP 131 1 (1990).

\bibitem[BoS]{BoS} Bouwknegt and Schoutens. $\cal W$-symmetry in
conformal field theory. Phys. Rep. 223 (1993) 183-276. *

\bibitem[BrPer]{BrPer} J.-L. Brylinski. (Co)-homologie d'intersection 
et faisceaux pervers. Bourbaki 1981-82. *

\bibitem[BrDirac]{BrDirac} J.-L Brylinski. Representations of loop 
groups, Dirac operators on loop space and modular forms. Topology 29 4 
(1990).

\bibitem[BrTheta]{BrTheta} J.-L. Brylinski. Loop groups and 
noncommutative theta
functions. Preprint, 1992. *

\bibitem[BrGerbe]{BrGerbe} J.-L. Brylinski. Holomorphic gerbes and the 
Beilinson
regulator. Ast\`erisque 226 (1994) 145-174.

\bibitem[Buium]{Buium} A. Buium. Differential algebraic groups of finite 
dimension. Springer LNM 1506.

\bibitem[Cor]{Cor} K. Corlette. Nonabelian Hodge theory. Proc. Symp.
Pure Math. 54 (1993) 2, 125-144. *

\bibitem[De1]{De1} P. Deligne. Theorie de Hodge II. IHES 1971. *

\bibitem[De1]{De2} P. Deligne. Le Determinant de la cohomologie. Current
trends in arithmetical algebraic geometry. Contemp. Math. 67 (1987)
93-177.

\bibitem[De2]{De3} P. Deligne. Letter to Drinfeld (1990). *

\bibitem[De3]{De4} P. Deligne. Letter to Simpson (1990). *

\bibitem[De4]{De5} P. Deligne. Letter to Morrison (1994). *

\bibitem[DeH]{DeH} P. Deligne and D. Husem\"{o}ller.
Survey of Drinfeld modules. Contemp. Math. 67 (25-91) 1987. *

\bibitem[Di]{Di} R. Dijkgraaf. Intersection theory, integrable
hierarchies and topological field theories. New symmetry principles in
quantum field theory, eds. J. Fr\"ohlich et al. Plenum Press (1992). *

\bibitem[DHL]{DHL} H. Doebner, J. Hennig and W. L\"ucke. Mathematical
guide to quantum groups. Preprint. *

\bibitem[DM]{DM} R. Donagi and E. Markman.

\bibitem[DP]{DP} R. Donagi and T.Pantev. The monodromy of
generalized theta functions. Preprint, 1996. *

\bibitem[DLH]{DLH} C. Dong, H.-S. Li and Y.-Z. Huang. Introduction to
vertex operator algebras I-III. Preprint, q-alg 94. *

\bibitem[Dr1]{Dr1} V. Drinfeld. Commutative subrings of certain
noncommutative rings. Funct. Anal Appl. 11/1 (11-14) 1977.

\bibitem[Dr2]{Dr2} V. Drinfeld. Varieties of modules of F-sheaves. 
Funct. Anal. Appl. 21 2 (1987).

\bibitem[Dr3]{Dr3} V. Drinfeld. Proof of Peterson's conjeture for GL_2 
over global fields of characteristic p. Funct. Anal. Appl. 22 1 (198).

\bibitem[Dr4]{Dr4} V. Drinfeld. Quasi-Hopf Algebras. Leningrad Math J.
1 (1990) 6, 1419-1457. *

\bibitem[Dr5]{Dr5} V. Drinfeld. On quasitriangular quasi-Hopf algebras
and a group closely connected with Gal(\Bbb{\bar Q}/\Bbb Q). Leningrad
Math J. 2 (1991) 4, 829-860. *

\bibitem[DS1]{DS1} V. Drinfeld and V. Sokolov. Equations of
Korteweg-deVries type and simple Lie algebras. Soviet Math Doklady 23
(1981) 3, 457-462.

\bibitem[DS2]{DS2} V. Drinfeld and V. Sokolov. Lie algebras and
equations of Korteweg-deVries type. J. Sov. Math. 30 (1985) 1975-2035. *

\bibitem[EF]{EF} B. Enriquez and E. Frenkel. Equivalence of two
approaches to the MKdV hierarchies. q-alg 9606???. *

\bibitem[FaGa]{FaGa} F. Falceto and K. Gawedzki. On quantum group 
symmetries of conformal field theories. Preprint, hep-th. *

\bibitem[Fal1]{Fal1} G. Faltings. Stable G-bundles and projective
connections. J. Alg. Geom. 2 (1993) 507-568.

\bibitem[Fal2]{Fal2} G. Faltings. A proof of the Verlinde formula. J.
Alg. Geom. 3 (1994) 347-374.

\bibitem[Fe]{Fe} B. Feigin. The Lie algebras ${\goth gl}(\lambda)$ and
cohomologies of Lie algebras of differential operators. Russian Math
Surveys 43/2 (1988) 169-170.

\bibitem[FF1]{FF1} B. Feigin and E. Frenkel. A family of representations
of affine Lie algebras. Russ. Math. Surveys 43:5 (1988) 221-222 (in
Russian).

\bibitem[FF2]{FF2} B. Feigin and E. Frenkel. Affine Kac-Moody Lie
algebras and bosonization. Physics and mathematics of strings, V.
Knizhnik memorial volume, eds. L. Brink et al. World Scientific, 1990.

\bibitem[FF3]{FF3} B. Feigin and E. Frenkel. Affine Kac-Moody algebras,
bosonization and resolutions. Lett. Math. Phys. 19 (1990) 307-317.

\bibitem[FF4]{FF4} B. Feigin and E. Frenkel. Bosonic ghost systems and
the Virasoro algebra. Phys. Lett. B 246 (1990), 71-74.

\bibitem[FF5]{FF5} B. Feigin and E. Frenkel. Quantization of
Drinfeld-Sokolov reduction. Phys. Lett. B 246 (1990), 75-81.

\bibitem[FF6]{FF6} B. Feigin and E. Frenkel. Affine Kac-Moody algebras
and semi-infinite flag manifolds. Comm. Math. Phys. 128 (1990) 161-189. 
*

\bibitem[FF7]{FF7} B. Feigin and E. Frenkel. Representations of affine
Kac-Moody algebras, bosonization and resolutions. Lett. Math. Phys. 19
(1990) 4, 307-317.

\bibitem[FF8]{FF8} B. Feigin and E. Frenkel. Semi-infinite Weil
complex and the Virasoro algebra. Comm. Math. Phys. 137 (1991) 617-639.
(Erratum: 147 (1992) 647-648.) *

\bibitem[FF9]{FF9} B. Feigin and E. Frenkel. Affine Kac-Moody algebras
at the critical level and Gelfand-Dikii algebras. Int. J. Math. Phys.
A7, Supplement 1A (1992) 197-215.

\bibitem[FF10]{FF10} B. Feigin and E. Frenkel. Conivariants of nilpotent
subalgebras of the Virasoro algebra and partition identities. I.M.
GElfand Seminar, eds. S. Gelfand and S. Gindikin. Adv. Sov. Math. 16/1
(1993) 139-148.

\bibitem[FF11]{FF11} B. Feigin and E. Frenkel. Integrals of motion and
quantum groups. In Proc. CIME, LNM 1410. *

\bibitem[FF12]{FF12} B. Feigin and E. Frenkel. Kac-Moody groups and
integrability of soliton equations. q-alg 1994. *

\bibitem[FFR]{FFR} B. Feigin, E. Frenkel and N. Reshetikhin. Gaudin
model, Bethe ansatz and critical level. hep-th 9402022. *

\bibitem[FT]{FT} B. Feigin and B. Tsygan. Additive K-theory and 
crystalline cohomology. Funct. Anal. Appl. 19 2 (1985).

\bibitem[Fel]{Fel} G. Felder. Ellipic quantum groups. Proc. Int. Cong. 
Of Math. Physics 1994. Intenrnational Press. *

\bibitem[FS]{FS} G. Felder and R. Silvotti. Conformal blocks of minimal
models on a Riemann surface. Comm. Math. Phys. 149 (1992) 17-40.

\bibitem[FiS1]{FiS1} M. Finkelberg and V. Schechtman. Localization of
$\goth u$-modules I: intersection cohomology of real arrangements.
hep-th 9411050. *

\bibitem[FiS2]{FiS2} M. Finkelberg and V. Schechtman. Localization of
$\goth u$-modules II: configuration spaces and quantum groups. q-alg
9412017. *

\bibitem[F0]{F0} E. Frenkel. Cohomology of the commutator subgroup of 
the braid group. Funct. Anal. Appl. 22 3 (1988).

\bibitem[F1]{F1} E. Frenkel. Affine Kac-Moody algebras at the critical 
level and
quantum Drinfeld-Sokolov reduction. Ph.D. Thesis, Harvard 1991. *

\bibitem[F2]{F2} E. Frenkel. $\cal W$-algebras and Langlands-Drinfeld
correspondence. New symmetries in quantum field theory, eds. J.
Fr\"ohlich et al. Plenum Press (1992) 433-477. *

\bibitem[F3]{F3} E. Frenkel. Determinant formulas for free field
representations of the Virasoro and Kac-Moody algebras. Phys. Lett. B286
(1992) 71-77.

\bibitem[F4]{F4} E. Frenkel. Free field realizations in representation
theory and conformal field theory. hep-th 9408109. *

\bibitem[F5]{F5} E. Frenkel. Affine algebras, Langlands duality and
Bethe ansatz. Proc. Int. Con. Math. Phys. 1994. *

\bibitem[FKRW]{FKRW} E. Frenkel, V. Kac, A. Radul and W. Wang. $\cal
W_{1+\infty}$ and ${\cal W}(GL_N)$ with central charge $N$. hep-th
9405121. *

\bibitem[FKW]{FKW} E. Frenkel, V. Kac and M. Wakimoto. Characters and
fusion rules for $\cal W$-algebras via quantized Drinfeld-Sokolov
reduction. Comm. Math. Phys. 147 (1992) 295-328.

\bibitem[FR]{FR} E. Frenkel and N. Reshetikhin. Quantum affine algebras
and deformations of the Virasoro and $\cal W$-algebrasa. q-alg 9505???. 
*


\bibitem[FSz1]{FSz1} E. Frenkel and A. Szenes. Dilogarithm identities,
$q$-difference equations and the Virasoro algebra. IMRN 2 (1993) 53-60.

\bibitem[FSz2]{FSz2} E. Frenkel and A. Szenes. Crystal bases,
dilogarithm identities and torsion in algebraic K-groups. hep-th
9304118.

\bibitem[FroG]{FroG} J. Fr\"ohlich and K. Gawedzki. Conformal field 
theory and geometry of strings. Preprint, hep-th. *

\bibitem[Fu]{Fu} W. Fulton. Young tableaux with applications to
representation theory and geometry. Preprint, 1994. *

\bibitem[FM]{FM} W. Fulton and R. MacPherson. A compactification of
configuration spaces. Ann. Math. 139 (1993) 183-225. *

\bibitem[GaLo]{GaLo} O. Gabber and F. Loeser. Faisceaux pervers 
l-adiques sur un tore. Duke Math. J. 83 3 (1996).

\bibitem[Gai]{Gai} D. Gaitsgory. Operads, Grothendieck topologies and 
deformation theory. Q-alg 1994. *

\bibitem[Ga]{Ga} K. Gawedzki. Conformal field theory. Bourbaki 704
(1988).

\bibitem[Gek]{Gek} E.-U. Gekeler. Moduli for Drinfeld modules.
The Arithmetic of Function Fields, eds. D. Goss, D. Hayes and M. Rosen.
deGruyter 1992. *

\bibitem[GGR]{GGR} I. Gelfand, M. Graev and V. Retakh. General
hypergeometric systems of equations and series of hypergeometric type.
Russian Math. Surveys 47 (1992) 4, 1-88.

\bibitem[GM]{GM} S. Gelfand and R. MacPherson. Verma modules and
Schubert cells: a dictionary. LNM 924 (1982) 1-50.

\bibitem[Ger]{Ger} J.-L. Gervais. Recent progress of the Liouville 
approach to 2D gravity and its Toda ({\cal W}) generalizations. Hep-th 
9212109. *

\bibitem[GerMat]{GerMat} J.-L. Gervais and Y. Matsuo. Classical $A_n$ 
{\cal W}-geometry. Hep-th 1992. *

\bibitem[GerSav]{GerSav} J.-L. Gervais and M. Saveliev. {\cal 
W}-geometry of the Toda systems associated with non-exceptional simple 
Lie algebras. hep-th 9312040. *

\bibitem[Gins]{Gins} P. Ginsparg. Applied conformal field theory. Les 
Houches lectures (1988). *

\bibitem[Gi1]{Gi1} V. Ginzburg. Fourier-Langlands transformations on
reductive groups. Funct. Anal. Appl. 22/2 (143-144) 1988. *

\bibitem[Gi2]{Gi2} V. Ginzburg. Sheaves on a loop group and Langlands
duality. Funct. Anal. Appl. 24/4 (326-327) 1990. *

\bibitem[Gi3]{Gi3} V. Ginzburg. Lagrangian construction of the 
enveloping
algebra U(sl_n). Funct. Anal. Appl. 26/1 (51-52) 1992. *

\bibitem[Gi4]{Gi4} V. Ginzburg. Resolution of diagonals and moduli 
spaces.
In: The Moduli Space of Curves, Birkhauser PM, 1995. *

\bibitem[Gi5]{Gi5} V. Ginzburg. Perverse sheaves on a loop group and
Langlands duality. q-alg, 1995. *

\bibitem[GiK]{GiK} V. Ginzburg and M. Kapranov. Koszul duality for
operads. Duke Math. J. (1994).

\bibitem[GKV1]{GKV1} V. Ginzburg, M. Kapranov and E. Vasserot.
Langlands reciprocity for algebraic surfaces. q-alg. 1994. *

\bibitem[GKV2]{GKV2} V. Ginzburg, M. Kapranov and E. Vasserot.
Elliptic algebras and equivariant elliptic cohomology I. q-alg 1995. *

\bibitem[GRV]{GRV} V. Ginzburg, N. Reshetikhin and E. Vasserot. Flag
varieties and quantum groups. Mathematical aspects of conformal and
topological field theories and quantum groups, eds. Sally et al.
Contemp. Math. 175.

\bibitem[GiV]{GiV} V. Ginzburg and E. Vasserot. Langlands reciprocity
for affine quantum groups of type $A_n$. IMRN 3 (1993) 67-85. *

\bibitem[GoM]{GoM} W. Goldman and J. Millson. Deformation theory of
representations of fundamental groups of compact K\"ahler manifolds.
Pub. Math. IHES 67 (1988) 43-96.

\bibitem[Gos1]{Gos1} D. Goss. A short introduction to rigid analytic
spaces. The Arithmetic of Function Fields, eds. D. Goss, D. Hayes and M.
Rosen. 
deGruyter 1992. *

\bibitem[Gos2]{Gos2} D. Goss. Drinfeld modules: cohomology and special
functions. Proc Symp. Pure Math 55/2 (309-362) 1994.

\bibitem[Gro]{Gro} I. Grojnowski. Instantons and affine algebras I. MRL 
3 2 (1996) 275-291.

\bibitem[Grot]{Grot} A. Grothendieck. Crystals and the deRham cohomology 
of schemes. Dix Expos\'es sur la cohomologie des sch\`emas. IHES 1968. *

\bibitem[HaLo]{HaLo} R. Hain and E. Looijenga. Mapping class groups and
moduli spaces of curves. alg-geom 960700? *

\bibitem[HaHo]{HaHo} L. Haine and E. Horozov. Tau functions and modules 
over the Virasoro algebra. W. Barth, K. Hulek an H. Lange (eds.), 
Abelian Varieties. DeGruyter 1995.

\bibitem[Hay]{Hay} D. Hayes. A brief introduction to Drinfeld modules.
The Arithmetic of Function Fields, eds. D. Goss, D. Hayes and M. Rosen.
deGruyter 1992. *

\bibitem[He1]{He1} D. Hejhal. Monodromy groups for higher-order
differential equations. BAMS 81 (1975) 590.

\bibitem[He2]{He2} D. Hejhal. Monodromy groups and Poincar\'e series.
BAMS 85 (1978) 339.

\bibitem[Hin]{Hin} V. Hinich. Descent of Deligne groupoids. q-alg
9606???. *

\bibitem[HiSc]{HiSc} V. Hinich and V. Schechtman. Deformation theory and 
Lie algebra homology. Preprint q-alg 1994. *

\bibitem[H1]{H1} N. Hitchin. Metrics on moduli spaces. Lefschetz
Centennial Conference. Contemp. Math. 58 (1986) 157-178. *

\bibitem[H2]{H2} N. Hitchin. Stable bundles and integrable systems. Duke
Math J. 54 (1987) 91-114. *

\bibitem[H3]{H3} N. Hitchin. Self-duality equations on a Riemann
surface. Proc LMS 55 (1987) 59-126. *

\bibitem[H4]{H4} N. Hitchin. Flat connections and geometric
quantization. Comm. Math. Phys. 131 (1990) 347-380. *

\bibitem[H5]{H5} N. Hitchin. Lie groups and Teichm\"uller space.
Topology 31 (1992) 451-487. *

\bibitem[H6]{H6} N. Hitchin. Frobenius Manifolds. Preprint, 1996.

\bibitem[HKLR]{HKLR} N. Hitchin, A. Karlhede, U. Lindstr\"{o}m,
M.  Ro\vee{c}ek. Hyperk\"{a}hler metrics and supersymmetry. Comm.
Math. Phys. 108 (535-589) 1987. *

\bibitem[Hull]{Hull} C. Hull. {\cal W}-Geometry. CMP 156 2 (1993).

\bibitem[JKL]{JKL} A. Jaffe, J. Klimek and A. Leszniewski. 
Representations of the Heisenberg algebra on a Riemann surface. CMP 126 
2 (1989).

\bibitem[KK]{KK} V. Kac and D. Kazhdan. Structure of representations of
infinite-dimensional Lie algebras. Adv. Math. 34 (1979) 97-108.

\bibitem[Ka1]{Ka1} M. Kapranov. Mutations and Serre functors on 
constructive
bundles. Funct. Anal. Appl. 24/2 (85-86) 1990. *

\bibitem[Ka2]{Ka2} M. Kapranov.  Eisenstein series and quantum affine
algebras. q-alg 1996. *

\bibitem[KSU1]{KSU1} T. Katsura, Y. Shimizu and K. Ueno. Formal groups
and conformal field theory over $\Bbb Z$. Integrable systems in quantum
field theory and statistical mechanics, Adv. Stud. Pure Math 19 (1989)
347-366. * 

\bibitem[KSU2]{KSU2} T. Katsura, Y. Shimizu and K. Ueno. New
bosonization and conformal field theory over $\Bbb Z$. Comm. Math. Phys.
121 (1989) 603-627. *

\bibitem[Kaz]{Kaz} D. Kazhdan. An introduction to Drinfeld's Shtuka.
Proc. Symp. Pure Math 33/2 (347-356) 1979. *

\bibitem[Kh]{Kh} T. Khovanova. Lie superalgebra structure on
eigenfunctions etc. Preprint, 1994. *

\bibitem[Kim]{Kim} B. Kim. Quantum cohomology of flag manifolds G/B and
quantum Toda lattices. q-alg 9607001. *

\bibitem[Kim]{Kim} T. Kimura. Prequantum BRST cohomology. Contemp. Math. 
132 (1992) 439-457.

\bibitem[Kn]{Kn} V. Knizhnik. Analytic field on a Riemann surface II. 
CMP 112 4 1987.

\bibitem[K1]{K1} M. Kontsevich. Virasoro Algebra and Teichm\"{u}ller 
Spaces.
Funct. Anal. Appl. 21/2 (1986) 156-157. *

\bibitem[K2]{K2} M. Kontsevich. Intersection Theory on the Moduli 
Space of Curves. Funct. Anal. Appl. 25/2 (1991) 123-129. *

\bibitem[K3]{K3} M. Kontsevich. Intersection Theory on the Moduli Space 
of
Curves and the Matrix Airy Function. Comm. Math. Phys. 147 (1992) 1-23. 
*

\bibitem[K4]{K4} M. Kontsevich. Homological Algebra and Mirror Symmetry.
Proc. ICM. 1994. *

\bibitem[K5]{K5} M. Kontsevich. Deformation Theory. Lecture Notes by
Alan Weinstein, 1995. *

\bibitem[Kos1]{Kos1} B. Kostant. The principal three-dimensional 
subgroup and the Betti numbers of a complex simple Lie group. Am. J. 
Math. 81 (1959) 973-1032. *

\bibitem[Kos2]{Kos2} B. Kostant. On Whittaker vectors and representation 
theory. Invent. Math. 48 (1978) 101-184. *

\bibitem[L1]{L1} G. Laumon. Sur les modules de Krichever. Preprint, 
1986. *

\bibitem[L2]{L2} G. Laumon. Corresponance de Langlands geometrique pour
les corps de fonctions. Duke Math. J. 54 (1987) 309-359. *

\bibitem[L3]{L3} G. Laumon. Un analogue globale du c\^one nilpotent.
Duke Math. J. 57 (1988) 647-671. *

\bibitem[L4]{L4} G. Laumon. Transformation de Fourier geometrique.
alg-geom 1996. *

\bibitem[Le]{Le} J. LePotier. Fibr\'es de Higgs et syst\`emes locaux.
Bourbaki 737 (1992).

\bibitem[LiZu]{LiZu} B. Lian and G. Zuckerman. Algebraic and geometric 
structures in string backgrounds. Preprint, hep-th. *

\bibitem[Lod]{Lod} J.-L. Loday. La renaissance de op\'erades. Bourbaki
792 (1994).

\bibitem[Loll]{Loll} R. Loll. Canonical and BRST-quantization of 
constrained systems. Contemp. Math. 132 (1992). *

\bibitem[Lo]{Lo} E. Looijenga. Intersection theory on Deligne-Mumford
compactifications. Bourbaki 768 (1993).

\bibitem[M]{M} R. MacPherson. Intersection homology and perverse
sheaves. Preprint, 1994. *

\bibitem[Maj]{Maj} S. Majid. Quasitriangular Hopf algebras and 
Yang-Baxter equations. Int. J. of Mod. Phys. A. 5 1 (1990) 1-91. *

\bibitem[MasSin]{MasSin} L. Mason and M. Singer. The twistor theory of 
equations of KdV type I. CMP 166 1 1994.

\bibitem[Mat]{Mat} O. Mathieu. Equations de K-Z et th\'eorie des
representations. Bourbaki 777 (1993).

\bibitem[Mats]{Mats} Y. Matsuo. Classical {\cal W_n}-symmetry and 
Grassmannian manifold. Hep-th. *

\bibitem[MazMes]{MazMes} B.Mazur and W. Messing. Universal extensions 
and one-dimensional crystalline cohomology. Springer LNM 370.

\bibitem[MazTat]{MazTat} B. Mazur and J. Tate. Canonical height pairings 
via biextensions. Arithmetic and Geometry I, eds. Artin and Tate. 
Birkhauser PM v.35.

\bibitem[Moore]{Moore} G. Moore. Geometry of the string equation. CMP 
133 2 (1990).

\bibitem[MoSei]{MoSei} G. Moore and N. Seiberg. Classical and quantum 
conformal field theory. CMP 123 2 (1989).

\bibitem[Mu]{Mu} D. Mumford. An algebro-geometric construction of
commuting operators and of solutions to the Toda lattice equation,
Korteweg-deVries equation and related non-linear equations.
Int. Symposium on Algebraic Geometry, Kyoto (115-153) 1977. *

\bibitem[NV]{NV} S. Nag and A. Verjovsky. Diff($S^1$) and the
Teichm\"uller Spaces. Comm. Math. Phys. 130 (1990) 123-138. *

\bibitem[Nam]{Nam} Y. Namikawa. A conformal field theory on Riemann
surfaces realized as quantized moduli theory of Riemann surfaces. Proc.
Symp. Pure Math 49 1 (1989) 413-443. *

\bibitem[Pen]{Pen} R. Penner. The decorated Teichm\"{u}ller space of 
punctured surfaces. CMP 112 (1987).

\bibitem[Polc]{Polc} J. Polchinski. What is string theory? Les Houches 
lectures (1994). *

\bibitem[Pol1]{Pol1} A. Polishchuk. Symplectic biextensions and a
generalization of the Fourier-Mukai transform. alg-geom 1995?. *

\bibitem[Pol2]{Pol2} A. Polishchuk. Biextensions, Weil representations
on derived categories, and theta functions. Harvard Ph.D. thesis, 1996.
*

\bibitem[Ran]{Ran} Z. Ran. Deformations of maps. Preprint. *

\bibitem[RaSav]{RaSav} A. Razumov and M. Saveliev. Differential geometry 
of Toda systems. Comm. Geom. Anal. 1995. *

\bibitem[S1]{S1} V. Schechtman. Vanishing cycles and quantum groups I.
IMRN 2 (1992) 39-44.

\bibitem[S2]{S2} V. Schechtman. Vanishing cycles and quantum groups II.
IMRN 10 (1992) 207-215.

\bibitem[STV]{STV} V. Schechtman, H. Terao and A. Varchenko.
Local systems over complements of hyperplanes and the Kac-Kazhdan
conditions for singular vectors. q-alg 1994. *

\bibitem[SV1]{SV1} V. Schechtman and A. Varchenko. Arrangements of
hyperplanes and Lie algebra homology. Invent. Math. 106 (1991) 139-194.

\bibitem[SV2]{SV2} V. Schechtman and A. Varchenko. Quantum groups and
homology of local systems. Algebraic geometry and analytic geometry,
Springer Berlin 1991, 182-191. *

\bibitem[Schneps]{Schneps} L. Schneps (ed.) The Grothendieck theory of 
Dessins d'Enfants. London Math Soc. Lecture Note Series 200, Cambridge 
Press 1994.

\bibitem[Seg]{Seg} G. Segal. The definition of conformal field theory. 
Preprint. *

\bibitem[SW]{SW} G. Segal and Wilson. Loop groups and equations of KdV
type. Pub. Math. IHES 63 (1985) 1-64. *

\bibitem[STS]{STS} M. Semenov-Tian-Shansky. Quantum integrable systems.
Bourbaki exp. 788 (1994) 365-388.

\bibitem[Sil]{Sil} R. Silvotti. Local systems on the complement of
hyperplanes and fusion rules in conformal field theory. IMRN 1994 3.

\bibitem[S1]{S1} C. Simpson. Constructing variations of Hodge structure
using Yang-Mills theory and applications to uniformization. JAMS 1
(1988) 867-918.

\bibitem[S2]{S2} C. Simpson. Report on twistor space and the mixed
Hodge structure on the fundamental group. Response to letter of Deligne, 
1990. *

\bibitem[S3]{S3} C. Simpson. Nonabelian Hodge theory. Proc. ICM 1990. *

\bibitem[S4]{S4} C. Simpson. Harmonic bundles on noncompact curves. JAMS
3 (1990) 713-770.

\bibitem[S5]{S5} C. Simpson. The ubiquity of variations of Hodge
structure. Proc Symp Pure Math 53, 329-347.

\bibitem[S6]{S6} C. Simpson. Higgs bundles and local systems. Pub. Math.
IHES 75(1992) 5-95. *

\bibitem[S7]{S7} C. Simpson. Moduli spaces of representations of the
fundamental group of a Kahler manifold I, II. Pub. Math. IHES (1994)

\bibitem[S8]{S8} C. Simpson. The Hodge filtration on nonabelian 
cohomology.
alg-geom 1996. *

\bibitem[So]{So} C. Sorger. La formule de Verlinde. Bourbaki 794 (1994).

\bibitem[Spr]{Spr} T. Springer. Quelques applications de la cohomologie 
d'intersection. Bourbaki 1981-82. *

\bibitem[Sta]{Sta} J. Stasheff. Homological (ghost) approach to 
constrained Hamiltonian systems. Contemp. Math. 132 (1992) 595-609. *

\bibitem[Sul]{Sul} D. Sullivan. Infinitesimal computations in topology. 
IHES. *

\bibitem[Ti]{Ti} T. Tijn. Finite and infinite $\cal W$-algebras and
their applications. Academisch proefschrift (1993).

\bibitem[TY]{TY} A. Tsuchiya and Y. Yamada. Conformal field theory on
moduli family of stable curves with gauge symmetries. Infinite
dimensional Lie algebras and groups, ed. V. Kac. World Scientific 1989.
*

\bibitem[Tuy]{Tuy} G. Tuynman. What are the rules of the game called 
BRST? Contemp. Math. 132 (1992). *

\bibitem[Vaf]{Vaf} C. Vafa. Topics in string theory: Notes by E. Zaslow. 
1993. *

\bibitem[Va]{Va} A. Varchenko. A geometric approach to representation
theory of quantum groups. Preprint, ?. *

\bibitem[Vor1]{Vor1} A. Voronov. BRST cohomology: a new derived functor. 
MSRI preprint, 1991. *

\bibitem[Vor2]{Vor2} A. Voronov. Semi-infinite cohomology and 
resolutions. MSRI preprint, 1992. *

\bibitem[W1]{W1} E. Witten. QFT, Grassmannians and algebraic curves. 
Comm. Math.
Phys. 113 (1986) 529-600. *

\bibitem[W2]{W2} E. Witten. Elliptic genera and quantum field theory. 
CMP 109 4 (1987).

\bibitem[W3]{W3} E. Witten. Coadjoint orbits of the Virasoro group.
Comm. Math. Phys. 114 (1988).

\end{thebibliography}
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