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Astron. Astrophys. 344, 639-646 (1999) AcknowledgementsG.S. acknowledges support from the von Humbolt foundation and discussions with Nir J. Shaviv. This work has been supported by the DFG (SFB 359, project C2). D.W. acknowledges valuable discussions with Martijn deKool. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: March 18, 1999 ![]() |