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Astron. Astrophys. 357, 61-65 (2000)

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Acknowledgements

We would like to thank A. Bressan for helpful discussions and comments. We are grateful to the referee, Y.D. Mayya, for comments and critics which helped us to improve the quality of the paper. This work was partly supported by the Italian Ministry for University and Research (MURST) under grant Cofin98-02-32.

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© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000
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