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Astron. Astrophys. 329, 559-570 (1998)
Acknowledgements
The authors thank E. Meyer-Hofmeister and H. Ritter for critical reading of the manuscript and helpful discussions. We are also grateful to R. Stehle for kindly allowing us to use parts of his numerical code.
© European Southern Observatory (ESO) 1998
Online publication: December 8, 1997
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