X-Ray Fluxes from Solrad 9 Satellite Landini, M. ; Monsignori Fossi, B. C. ; Poletto, G. ; Russo, D. ; Tagliaferri, G. L. Abstract Publication: Solar Physics Pub Date: July 1970 DOI: 10.1007/BF00963955 Bibcode: 1970SoPh...13..226L