International Union of Pure and Applied Physics; Max-Planck-Institut fuer Physik und Astrophysik, Garching/Muenchen (F.R. Germany). Inst. fuer Extraterrestrische Physik; p. 256; 1975; 14. international cosmic ray conference; Muenchen, F.R. Germany; 15 Aug 1975; Short communication only. Available from ZAED.