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Astron. Astrophys. 362, 646-654 (2000) AcknowledgementsI thank the referee Dr. P. Chadwick for comments which helped to improve the paper and careful correction of the text of the paper. This work is supported by the Polish KBN grant 2P03C 006 128.
© European Southern Observatory (ESO) 2000 Online publication: October 24, 2000 ![]() |