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Astron. Astrophys. 336, 553-564 (1998) AcknowledgementsThis work has been supported by NSF (grants AST95-28338 and INT94-15868) by an AKP grant (96/2-412 2,1). P.Y. gratefully acknowledges helpful conversations with Neil Balmforth and Ed Spiegel.
© European Southern Observatory (ESO) 1998 Online publication: July 20, 1998 ![]() |