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上久保 正, 宮脇 俊夫, 岩井 重久. "99.ビタミンB_<12>資源としての活性汚泥(IV) : コバルト塩および弗素化合物添加による活性汚泥中のB_<12>の変化(第6回日本ビタミン学会研究発表要旨)." VITAMINS 7.0 (1953) 906-907