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Seiichi Kitamura, Susumu Hashimoto, Takanobu Shimazaki, Masakazu Fukuchi, Hideo Takada, Yoshishige Tachibana, Michio Matsuoka, Haruo Sato. "Studies on the fertilizing effect of sewage sludge." Japanese Journal of Water Treatment Biology 5.2 (1969) 6-16