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by Iwata, Shuichi; Ohsawa, Yukio; Tsumoto, Shusaku; et al.
by Ohsawa, Yukio; Tsumoto, Shusaku
by Ohsawa, Yukio; Nishihara, Yoko
by Ohsawa, Yukio; McBurney, Peter
by Ohsawa, Yukio; Abe, Akinori
by Yukio Ohsawa
by Yukio Ohsawa; ?Peter McBurney