Astron. Astrophys. 351, 551-553 (1999)

Acknowledgements

I thank an anonymous referee for useful comments. I thank Prof. S.M.Chitre for discussions and important suggestions. I thank the Indian National Science Academy for a Senior Scientist Fellowship. I thank the Director of Tata Institute of Fundamental Research for allowing the use of the Library and other facilities during this research. I thank the colleagues at the Bombay University, particularly Prof. S.B. Patel

© European Southern Observatory (ESO) 1999

Online publication: November 3, 1999
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