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Astron. Astrophys. 345, 391-402 (1999) AcknowledgementsLSJ benefitted from the support provided by FAPESP, CNPq and PRONEX/FINEP to his work, and warmly acknowledges the hospitality and support of Observatoire de Meudon, where most of this work was realized.
© European Southern Observatory (ESO) 1999 Online publication: April 19, 1999 ![]() |