Astron. Astrophys. 364, 557-562 (2000)

Acknowledgements

The authors thank the referee Dr. R. Viotti whose remarks contributed to improve the paper. N.T. is also grateful to Dr. M. Friedjung and Dr. N. Markova for their comments and helpful advices.

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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