High-Energy Muons in Extensive Air Shower and the Composition of Primary Cosmic Ray Mitsui, K. ; Muraki, Y. ; Okada, A. ; Ōhashi, Y. ; Higashi, S. ; Sato, T. ; Takahashi, T. ; Kamiya, Y. ; Nakamura, I. ; Shibata, S. ; Kobayakawa, K. ; Inazawa, H. ; Kitamura, T. ; Minorikawa, S. ; Mizutani, K. ; Kojima, H. Abstract Publication: International Cosmic Ray Conference Pub Date: 1987 Bibcode: 1987ICRC....6..204M