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Astron. Astrophys. 338, 521-526 (1998) AcknowledgementsI acknowledge the support of the Fellowship program of the Alexander von Humboldt Foundation. I would like to thank Ulrich Anzer and the referee for carefully reading the manuscript and suggesting improvements and Harald Lesch for kind hospitality and very interesting and useful discussions. The work was partly supported by INTAS-RFBR under the grant 95-0316, and by RFBR under the grant 96-02-19179-a.
© European Southern Observatory (ESO) 1998 Online publication: September 14, 1998 ![]() |