X-Ray Properties of QSO's from Einstein Observations Soltan, A. ; Branduardi, G. ; Fabbiano, G. ; Feigelson, E. ; Giacconi, R. ; Murray, S. ; Pye, J. ; Tananbaum, H. ; Zamorani, G. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: March 1979 Bibcode: 1979BAAS...11..465S