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Astron. Astrophys. 357, 931-937 (2000) AcknowledgementsJ.D.N.Jr. acknowledges partial financial support from the CNPq Brazilian Agency. PdL acknowledges partial support grants from the Société de Secours des Amis des Sciences and the Fondation des Treilles . ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: June 5, 2000 ![]() |