Astron. Astrophys. 327, 432-440 (1997)

Acknowledgements

BRR thanks the Max-Planck-Institut für Kernphysik for the grant of a visitor's stipend, during which this work was performed. We are grateful to R.O. Dendy, P. Duffy and Y.A. Gallant for stimulating discussions.

© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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