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Astron. Astrophys. 338, 273-291 (1998) AcknowledgementsComments on the original manuscript by Dr. Sergey Silich and by an anonymous referee were helpful in improving this paper, and they are gratefully acknowledged. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: September 8, 1998 ![]() |