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Astron. Astrophys. 333, 433-444 (1998) AcknowledgementsWe wish to thank James Binney, Annibale D'Ercole, Paul Goudfrooij and Alvio Renzini for stimulating discussions. This work has been partially supported by the contract ASI-95-RS-152. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: April 20, 1998 ![]() |