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Astron. Astrophys. 360, 637-641 (2000) AcknowledgementsThis research has made use of the NASA's Astrophysics Data System Abstract Service. We thank Drs. D. Holmgren and M.T. Richards for discussions. This work has been supported through the Slovak Academy of Sciences Grant No.5016/98. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: August 17, 2000 ![]() |