Search for 511 KeV e+/- Annihilation Radiation from Mildly Active Galaxies Using HEAO 3 Marscher, A. P. ; Brecher, K. ; Ling, J. C. ; Mahoney, W. A. ; Wheaton, W. A. ; Jacobson, A. S. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1982 Bibcode: 1982BAAS...14Q.975M