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Astron. Astrophys. 358, 841-844 (2000)

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Acknowledgements

I thank referee R. C. Hartman for his comments, suggestions and linguistic corrections to the manuscript. This work is partially supported by the National Pan Deng Project of China and the National Natural Scientific Foundation of China and the National 973 Project of China.

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© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000
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