On the generation mechanism of high energy pions in cosmic rays. Grigorov, N. L. ; Shestoperov, V. Ya. ; Brikker, S. I. ; Podgurskaya, A. V. ; Poperyekova, L. M. ; Plekhova, A. I. ; Savelyeva, A. I. ; Sobinyakov, V. A. Abstract Publication: International Cosmic Ray Conference Pub Date: 1965 Bibcode: 1965ICRC....2..851G