Simultaneous X-ray Spectra and X-ray Images of an Active Region Gerassimenko, M. ; Davis, J. M. ; Chase, R. C. ; Krieger, A. S. ; Silk, J. K. ; Vaiana, G. S. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: March 1975 Bibcode: 1975BAAS....7..347G