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Astron. Astrophys. 335, L5-L8 (1998) AcknowledgementsWe thank M. Garcia, A. Fruchter, B. Montesinos and E. Pian for fruitful conversations. This work has been partially supported by Spanish CICYT grant ESP95-0389-C02-02. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: June 12, 1998 ![]() |