CTQ 839: Gravitational Lens or Binary Quasar? Morgan, N. D. ; Schechter, P. L. ; Winn, J. N. ; Burley, G. ; Persson, E. ; Thompson, I. ; Costa, E. ; Maza, J. ; Ruiz, M. -T. Abstract Publication: Gravitational Lensing: Recent Progress and Future Go Pub Date: January 2001 Bibcode: 2001ASPC..237...45M