T. Buscher, Path-integral derivation of quantum duality in nonlinear sigma-models, Physics Letters B, vol.201, issue.4, p.466, 1988.
DOI : 10.1016/0370-2693(88)90602-8

E. S. Fradkin and A. A. Tseytlin, Quantum equivalence of dual field theories, Annals of Physics, vol.162, issue.1, p.31, 1985.
DOI : 10.1016/0003-4916(85)90225-8

K. Sfetsos, Non-Abelian duality, parafermions, and supersymmetry, Physical Review D, vol.54, issue.2, p.1682, 1996.
DOI : 10.1103/PhysRevD.54.1682

H. Vega, YANG-BAXTER ALGEBRAS, INTEGRABLE THEORIES AND QUANTUM GROUPS, International Journal of Modern Physics A, vol.04, issue.10, p.2371, 1989.
DOI : 10.1142/S0217751X89000959

E. Witten, Non-abelian bosonization in two dimensions, Communications in Mathematical Physics, vol.48, issue.4, p.455, 1984.
DOI : 10.1007/BF01215276

E. S. Fradkin and A. A. Tseytlin, Quantum equivalence of dual field theories, Annals of Physics, vol.162, issue.1, p.31, 1985.
DOI : 10.1016/0003-4916(85)90225-8

T. Chave and G. Valent, On a class of compact and non-compact quasi-Einstein metrics and their renormalizability properties, Nuclear Physics B, vol.478, issue.3, p.758, 1996.
DOI : 10.1016/0550-3213(96)00341-0

I. Bakas and K. Sfetsos, T-duality and world-sheet supersymmetry, Physics Letters B, vol.349, issue.4, p.448, 1995.
DOI : 10.1016/0370-2693(95)00290-2

E. S. Fradkin and A. A. Tseytlin, Quantum equivalence of dual field theories, Annals of Physics, vol.162, issue.1, p.31, 1985.
DOI : 10.1016/0003-4916(85)90225-8

G. Bonneau, SOME FUNDAMENTAL BUT ELEMENTARY FACTS ON RENORMALIZATION AND REGULARIZATION: A CRITICAL REVIEW OF THE EIGHTIES, International Journal of Modern Physics A, vol.05, issue.20, p.3831, 1990.
DOI : 10.1142/S0217751X90001641

E. L. Ince, Ordinary Differential Equations, The Mathematical Gazette, vol.18, issue.231, p.16, 1956.
DOI : 10.2307/3605524

C. M. Hull, Lectures on non-linear sigma models and strings Super Field Theories, p.77, 1986.

K. Galicki, Multi-centre metrics with negative cosmological constant, Classical and Quantum Gravity, vol.8, issue.8, p.1529, 1991.
DOI : 10.1088/0264-9381/8/8/017

G. Gibbons, D. Olivier, P. Ruback, and G. Valent, Multicentre metrics and harmonic superspace, Nuclear Physics B, vol.296, issue.3, p.679, 1988.
DOI : 10.1016/0550-3213(88)90039-9

M. Przanowski, Killing vector fields in self???dual, Euclidean Einstein spaces with ?????0, Journal of Mathematical Physics, vol.32, issue.4, p.1004, 1991.
DOI : 10.1063/1.529375

E. J. Flaherty, The nonlinear graviton in interaction with a photon, General Relativity and Gravitation, vol.2, issue.11, p.961, 1978.
DOI : 10.1007/BF00784657

S. Kloster, M. Som, and A. Das, On the stationary gravitational fields, Journal of Mathematical Physics, vol.15, issue.7, p.1096, 1974.
DOI : 10.1063/1.1666759

G. Gibbons and S. Hawking, Gravitational multi-instantons, Physics Letters B, vol.78, issue.4, p.430, 1978.
DOI : 10.1016/0370-2693(78)90478-1

N. Hitchin, Polygons and gravitons, Mathematical Proceedings of the Cambridge Philosophical Society, vol.74, issue.03, p.465, 1979.
DOI : 10.1007/BF01352140

D. Olivier and G. Valent, Hyperk??hler generalization of taub-NUT from harmonic superspace, Physics Letters B, vol.189, issue.1-2, p.79, 1987.
DOI : 10.1016/0370-2693(87)91273-1

G. Gibbons, D. Olivier, P. Ruback, and G. Valent, Multicentre metrics and harmonic superspace, Nuclear Physics B, vol.296, issue.3, p.679, 1988.
DOI : 10.1016/0550-3213(88)90039-9

A. Galperin, E. Ivanov, and V. Ogievetsky, Duality transformations and most general matter self-couplings in N = 2 supersymmetry, Nuclear Physics B, vol.282, p.74, 1987.
DOI : 10.1016/0550-3213(87)90677-8

G. W. Gibbons, P. Rychenkova, and R. Goto, HyperK??hler Quotient Construction of BPS Monopole Moduli Spaces, Communications in Mathematical Physics, vol.186, issue.3, p.581, 1997.
DOI : 10.1007/s002200050121

K. Galicki, Multi-centre metrics with negative cosmological constant, Classical and Quantum Gravity, vol.8, issue.8, p.1529, 1991.
DOI : 10.1088/0264-9381/8/8/017

A. Galperin, E. Ivanov, V. Ogievetsky, and E. Sokatchev, N=2 supergravity in superspace: different versions and matter couplings, Classical and Quantum Gravity, vol.4, issue.5, p.1255, 1987.
DOI : 10.1088/0264-9381/4/5/023

B. De-wit, M. Ro?ek, and S. Vandoren, Gauging isometries on hyperk??hler cones and quaternion-K??hler manifolds, Physics Letters B, vol.511, issue.2-4, pp.hep-th, 104215.
DOI : 10.1016/S0370-2693(01)00636-0

L. Alvarez-gaumé and D. Z. Freedman, Geometrical structure and ultraviolet finiteness in the supersymmetric ?-model, Communications in Mathematical Physics, vol.45, issue.3, p.443, 1981.
DOI : 10.1007/BF01208280

S. Kloster, M. Som, and A. Das, On the stationary gravitational fields, Journal of Mathematical Physics, vol.15, issue.7, p.1096, 1974.
DOI : 10.1063/1.1666759

G. Gibbons and S. Hawking, Gravitational multi-instantons, Physics Letters B, vol.78, issue.4, p.430, 1978.
DOI : 10.1016/0370-2693(78)90478-1

M. Przanowski, Killing vector fields in self???dual, Euclidean Einstein spaces with ?????0, Journal of Mathematical Physics, vol.32, issue.4, p.1004, 1991.
DOI : 10.1063/1.529375

J. F. Plebanski and M. Demianski, Rotating, charged, and uniformly accelerating mass in general relativity, Annals of Physics, vol.98, issue.1, p.98, 1976.
DOI : 10.1016/0003-4916(76)90240-2

E. J. Flaherty, The nonlinear graviton in interaction with a photon, General Relativity and Gravitation, vol.2, issue.11, p.961, 1978.
DOI : 10.1007/BF00784657

C. Lebrun, Counter-examples to the generalized positive action conjecture, Communications in Mathematical Physics, vol.42, issue.4, p.591, 1988.
DOI : 10.1007/BF01221110

H. Pedersen and K. P. Tod, Einstein metrics and hyperbolic monopoles, Classical and Quantum Gravity, vol.8, issue.4, p.751, 1991.
DOI : 10.1088/0264-9381/8/4/018

D. M. Calderbank and H. Pedersen, Selfdual Einstein metrics with torus symmetry, math, 105263.
DOI : 10.4310/jdg/1090351125
URL : http://arxiv.org/abs/math/0105263

A. Galperin, E. Ivanov, V. Ogievetsky, and E. Sokatchev, Conformal invariance in harmonic superspace, preprint JINR, Quantum Field Theory and Quantum Statistics, pp.2-85, 1985.

S. Ketov, Superconformal hypermultiplets in superspace, Nuclear Physics B, vol.582, issue.1-3, p.95, 2000.
DOI : 10.1016/S0550-3213(00)00252-2

A. Swann, HyperK???hler and quaternionic K???hler geometry, Mathematische Annalen, vol.14, issue.2, p.421, 1991.
DOI : 10.1007/BF01446581