Observations of the Crab Nebula by HEAO-1 Matteson, J. L. ; Gruber, D. E. ; Kinzer, R. L. ; Nolan, P. L. ; Peterson, L. E. ; Primini, F. ; Wheaton, W. ; Dobson, C. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1978 Bibcode: 1978BAAS...10..679M