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Astron. Astrophys. 325, 19-26 (1997)

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Acknowledgements

The authors wish to thank Prof. Y.Y. Zhou for helpful suggestions. The anonymous referee is acknowledged for useful comments. The EGRET team are kindly thanked for their great effort in preparing the Catalogs of High Energy Gamma Ray Sources. This work is supported by a Strategic Research Grant of the City University of Hong Kong.

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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