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Astron. Astrophys. 351, L15-L18 (1999)

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Acknowledgements

This research has made use of data obtained through the HEASARC Online Service, provided by the NASA/GSFC. S. Trudolyubov is partially supported by RBRF grants 96-15-96343, 97-02-16264 and INTAS grant 93-3364-ext.

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© European Southern Observatory (ESO) 1999

Online publication: November 3, 1999
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