HEAO-1 Response to Solar Gamma Rays. Hudson, H. S. ; Baity, W. A. ; Gruber, D. E. ; Knight, F. K. ; Nolan, P. L. ; Matteson, J. L. ; Peterson, L. E. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: June 1978 Bibcode: 1978BAAS...10..516H