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Astron. Astrophys. 355, 880-884 (2000)

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Acknowledgements

We are grateful to the referee for his/her comments and suggestions! This work is supported by the National Pan Deng Project of P.R. China and the National Natural Scientific Foundation of P.R. China and the National 973 project of P.R. China.

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© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000
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