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Eimatsu Takakuwa, Yoshito Ohnaka, Kazuo Saito, Toshiharu Masukawa, Shigefusa Fujita, Yoshinori Ando. "Studies on the Function of Concentration Maintenance (TAF) (Part 15)." Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene) 24.5-6 (1970) 477-479