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Astron. Astrophys. 324, 505-522 (1997) AcknowledgementsIt is a pleasure to thank Tad Pryor, the referee, for his careful reading of the paper and his excellent suggestions for improvements. P.D. acknowledges support through a grant from the Swiss National Science Foundation.
© European Southern Observatory (ESO) 1997 Online publication: May 26, 1998 ![]() |