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Astron. Astrophys. 345, 307-314 (1999)

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Acknowledgements

The authors thank I.G. Kovalenko, V.M. Lipunov, V.V. Mustsevoj and M.E. Prokhorov for fruitful discussions and valuable comments. This research is partially supported by Fund INTAS, grant number 95-0988.

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© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999
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