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Astron. Astrophys. 327, 392-403 (1997) AcknowledgementsThe paper was financed from the research project 2 Z6Z6 001 05p13. One of us (J.Z.) was also suported from the project 2 P03C 009 08.
© European Southern Observatory (ESO) 1997 Online publication: April 8, 1998 ![]() |