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Astron. Astrophys. 344, 27-35 (1999) AcknowledgementsThe authors wish to thank Arjun Berera, Fang Li-Zhi, Jim Fry, Salman Habib, Herb Schnopper and Lee Smolin, for discussion. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: March 10, 1999 ![]() |