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Astron. Astrophys. 346, 1011-1019 (1999) AcknowledgementsThe author is greatly indebted to Dr. A.V. Krivov for useful discussions and advice. Thanks are also due to Dr. H. Krüger for his assistance in evaluating this paper. The work was supported by a grant for young scientists of St. Petersburg in 1997, 1998. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: June 17, 1999 ![]() |