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Astron. Astrophys. 347, L47-L50 (1999) AcknowledgementsI am pleased to thank G.Rüdiger for stimulating discussions. This work was supported by the Russian Foundation of Basic Research under the grant 97-02-18086. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: June 6, 1999 ![]() |