X-Ray Observations of the Crab Nebula with the Einstein Observatory Tananbaum, H. ; Epstein, A. ; Forman, W. ; Giacconi, R. ; Grindlay, J. ; Harden, F. R., Jr. ; Jones, C. ; Schreier, E. ; Seward, F. ; van Speybroeck, L. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: March 1979 Bibcode: 1979BAAS...11..424T