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Astron. Astrophys. 358, 682-688 (2000) AcknowledgementsThis research was supported by the Deutsche Forschungsgemeinschaft through Grant SFB 301. A. Sternberg thanks the Israel Science Foundation for Support. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: June 8, 2000 ![]() |