HEAO-1 Measurement of the Energy Dependence of the Fluctuations in the Cosmic X-Ray Background. Shafer, R. A. ; Boldt, E. ; Szymkowiak, A. E. ; Holt, S. ; Rothschild, R. ; Serlemitos, P. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: March 1978 Bibcode: 1978BAAS...10..390S