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Astron. Astrophys. 355, 891-899 (2000) AcknowledgementsThis work is part of the PhD thesis of FL. We thanks P. Petitjean, J. Silk, M. Fioc, R. Terlevich, N. Prantzos, F. Combes, G. Tenorio-Tagle and the referee R. Dufour for helpful suggestion and discussions.
© European Southern Observatory (ESO) 2000 Online publication: March 21, 2000 ![]() |