@inproceedings{oai:repo.qst.go.jp:00053279,
 author = {Shinozaki, Kenji and Chikawa, Michiyuki and Fukushima, Masaki and Hayashida, Naoaki and Honda, Ken and Inoue, Naoya and Kadota, Kenji and Kakimoto, Fumio and Kamata, Kouichi and Kawaguchi, Setsuo and Kawakami, Saburo and Kawasaki, Yoshiya and Kawasumi, Norio and Mase, Keiichi and Mizobuchi, Tomoko and Nagano, Motohiko and Ohoka, Hideyuki and Osone, Satoko and Sakaki, Naoto and Sakurai, Nobuyuki and Sasaki, Makoto and Sasano, Masahiko and Shimizu, Hirohiko and Takeda, Masahiro and Teshima, Masahiro and Torii, Reiko and Tsushima, Itsurou and Uchihori, Yukio and Yamamoto, Tokonatsu and Yoshida, Shigeru and Yoshii, Hisashi and 川崎 賀也 and 榊 直人 and 内堀 幸夫},
 book = {Proceedings of International Cosmic Ray Conference},
 month = {Jun},
 note = {We have observed ultra-high energy cosmic rays above the Greisen-Zatsepin-Kuz'min cut-off energy by Akeno Giant Air Shower Array. Their chemical composition is a key discriminator of origin models. In the present work, we estimate the average composition by an analysis of muons in air showers with AIRES+QGSJET simulation. The data matches the prediction for light hadron primaries and no indication has been found for a gamma-ray dominance.},
 pages = {401--404},
 title = {Chemical Composition of Ultra-High Energy Cosmic Rays Observed by AGASA},
 volume = {28},
 year = {2003}
}