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Astron. Astrophys. 360, L43-L46 (2000)

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Acknowledgements

We gratefully acknowledge Tzihong Chiueh for useful discussion and comments, and an anonymous referee for valuable suggestions. This work was supported by the National Science Foundation of China, under Grant 19725311.

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© European Southern Observatory (ESO) 2000

Online publication: August 23, 2000
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