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Astron. Astrophys. 364, 543-551 (2000) AcknowledgementsOne of us (G.D.) has been partially supported by the Ministry for Sciences and Technology of Serbia through the project "Astrometrical, Astrodynamical and Astrophysical investigations". H.R-L & P.R. acknowledge some financial support from Athens University and the National Observatory of Athens. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: January 29, 2001 ![]() |