Astron. Astrophys. 351, 733-740 (1999)
Acknowledgements
V.M.
ade
highly acknowledges the visitor grant obtained from the Universitat de
les Illes Balears and expresses his gratitude to J.L. Ballester for
making this visit possible. This research has been partially supported
by grant DGES PB96-0092.
© European Southern Observatory (ESO) 1999
Online publication: November 3, 1999
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