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Astron. Astrophys. 361, 415-428 (2000) AcknowledgementsWe wish to thank Roser Pelló and Bernard Fort for fruitful discussions and encouragements. This work was supported by the TMR network "Gravitational Lensing: New Constraints on Cosmology and the Distribution of Dark Matter" of the European Commission under contract No: ERBFMRX-CT98-0172. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: October 2, 2000 ![]() |