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Astron. Astrophys. 325, 559-562 (1997) AcknowledgementsWe thank Michael Andersen and Soren Frandsen for many discussions. This work was supported in part by the Danish National Research Foundation through its establishment of the Theoretical Astrophysics Center. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: April 28, 1998 ![]() |