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Astron. Astrophys. 357, 1056-1062 (2000)

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Acknowledgements

We thank Prof. Wang J.X. and Dr. Wang H.N. for helpful discussions, the referee, Dr. J.L. Ballester, for helpful comments, and Dr. Qiu J. for improving the manuscript in language. This work is supported by the National Natural Science Foundation of China (NSFC), under grants 19791090 and 49990450.

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© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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