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by Ohsawa; Yukio
by Teruaki Hayashi; Yukio Ohsawa
by Ohsawa, Yukio; Abe, Akinori
by Ohsawa, Yukio; Yada, Katsutoshi; Ito, Takayuki; et al.
by Yukio Ohsawa; Katsutoshi Yada; Takayuki Ito
by Ohsawa, Yukio; McBurney, Peter
by Abraham, Ajith; Dote, Yasuhiko; Furuhashi, Takeshi; et al.
by Ohsawa, Yukio; Tsumoto, Shusaku
by Iwata, Shuichi; Ohsawa, Yukio; Tsumoto, Shusaku; et al.