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Astron. Astrophys. 333, 1100-1106 (1998)

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Acknowledgements

The authors would like to thank Prof. C. Xu of Nanjing Normal University for helpful discussion. We also thank Prof. V. A. Brumberg for his kind comments. This research is supported by The National Natural Science Foundation of China.

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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