List of flares observed at Ondrejov observatory during the I.G.Y. Kvicala, J. ; Hrebik, F. ; Letfus, V. ; Olmr, J. ; Svestka, Z. ; Krivsky, L. Abstract Publication: Publications of the Astronomical Institute of the Czechoslovak Academy of Sciences Pub Date: 1960 Bibcode: 1960PAICz..43....1K