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Number of items: 1. Brusa, M. and Comastri, A. and Gilli, R. et al. (2009) High-redshift quasars in the cosmos survey: the space density of z > 3 x-ray selected QSOs. Astrophysical Journal, 693 (1). pp. 8-22. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20090428-095914449 |