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Astron. Astrophys. 336, 697-720 (1998)
Acknowledgements
The authors thank B. Elmegreen, B. Deiss, R. Schieder, Y.-Z. Yue for many helpful comments and clarifying discussions on the manuscript. This research was supported by the Deutsche Forschungsgemeinschaft through grant SFB 301C.
© European Southern Observatory (ESO) 1998
Online publication: July 20, 1998
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