Observations of Three Slow X-Ray Pulsars from HEAO-1. Knight, F. ; Matteson, J. ; Gruber, D. ; Peterson, L. E. ; Cooke, B. A. ; Campbell, P. ; Wheaton, W. A. ; Lewin, W. H. G. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: June 1978 Bibcode: 1978BAAS...10..507K