Astron. Astrophys. 324, 27-31 (1997)

Acknowledgements

This work was supported by the "NWO Bezoekers Beurs grant number B 78-324", The Netherlands, and in part by grant of the SEC "KOSMION", Russia. The author is grateful to H.Butcher, R.Braun, E.van Dishoeck and S.Pogrebenko for stimulating and valuable discussions.

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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