Dependence of the Density of the Upper Atmosphere on Solar Activity from Satellite Drag Data Shubin, V. N. ; Deminov, M. G. ; Nepomnyashchaya, E. V. ; Obridko, V. N. ; Shelting, B. D. ; Chizhenkov, V. A. Abstract Publication: Cosmic Research Pub Date: March 1997 Bibcode: 1997CosRe..35..114S