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Astron. Astrophys. 347, 572-582 (1999) AcknowledgementsThis work has been supported in part by the European Commission under the Human Capital and Mobility network contract ERBCHRXCT930339 and the PECO-NIS contract ERBCIPDCT940629.
© European Southern Observatory (ESO) 1999 Online publication: June 30, 1999 ![]() |