Investigation of a high-energy electron-photon cascade in emulsion Fenyves, E. ; Frenkel, A. ; Telbisz, F. ; Pernegr, J. ; Petrzilka, V. ; Sedlak, J. ; Vrana, J. Abstract Publication: International Cosmic Ray Conference Pub Date: 1960 Bibcode: 1960ICRC....2..290F