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Astron. Astrophys. 355, 804-808 (2000) AcknowledgementsThis work has been supported by the Russian Foundation of Fundamental Researches, Grants No 98-02-16238 and 99-02-18244, by the Commission for International Cooperation of the Austrian Academy of Sciences, and by INTAS, Grant No 97-1372. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: March 9, 2000 ![]() |