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Astron. Astrophys. 350, 497-512 (1999) AcknowledgementsWe want to thank Wolfgang Keil, Georg Raffelt, Thomas Strobel and Fridolin Weber for many helpful discussions. Two of us, K. S. and Ch. S., gratefully acknowledge the Bavarian State for financial support. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: October 4, 1999 ![]() |