Observation of coincident air showers over a very large area
N.Ochi, A.Iyono, T.Konishi, T.Nakatsuka, S.Ohara, K.Okei, N.Takahashi, S.Tsuji, T.Wada, I.Yamamoto, Y.Yamashita, Y.Yanagimoto
Exxtensive Air Shower
Nuclear Physics
Elsevier
B
122
333
336