Quasiperiodic Hard X-Ray Pulsations in Solar Flares Bogovalov, S. V. ; Iyudin, A. F. ; Kotov, Y. D. ; Dolidze, V. I. ; Estulin, I. V. ; Vedrenne, G. ; Niel, M. ; Barat, C. ; Chambon, G. ; Talon, M. Abstract Publication: Soviet Astronomy Letters Pub Date: April 1983 Bibcode: 1983SvAL....9..163B