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Astron. Astrophys. 359, 759-765 (2000)
Acknowledgements
The authors express their cordial thanks to an unknown referee for
his/her constructive comment and to the Editor for his help in
improving the paper. K.M.'s and J.P.'s work has been financially
supported by the grant from the State Committee for Scientific
Research Republic of Poland, KBN grant no. 2 PO3D 01717 and INTAS
97-31931, respectively. Numerical simulations have been performed at
the Supercomputing Center of
Pozna
.
© European Southern Observatory (ESO) 2000
Online publication: July 7, 2000
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