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Astron. Astrophys. 363, L29-L32 (2000) AcknowledgementsWe thank E. Romano-Díaz for substantial contributions, F. Bernardeau for instigating this line of research, and V. Icke and B. Jones for useful discussions.
© European Southern Observatory (ESO) 2000 Online publication: December 5, 2000 ![]() |