Astron. Astrophys. 357, 681-685 (2000)

Acknowledgements

We thank C. Bertout and L.M. Hobbs for comments which helped us to improve this paper. TH wishes to acknowledge a stipendium from the Max-Planck-Gesellschaft and the hospitality of Professor J. Trümper for support of this research.

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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