VizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'Observational constraints on the dependence of radio-quiet quasar X-ray emission on black hole mass and accretion rate.' (bibcode: 2008ApJS....
Kelly, B. C. (Creator), Bechtold, J. (Creator), Trump, J. R. (Creator), Vestergaard, M. (Creator), Siemiginowska, A. (Creator) (2009). AGN X-Ray emission and black holes. Centre de Donnees Strasbourg (CDS). 10.26093/cds/vizier.21760355