Não informado. (1921). Science reports of the Tohoku University. Tohoku University, Faculty of Science.
Chicago-referens (17:e uppl.)Não informado. Science Reports of the Tohoku University. Sendai, Japão: Tohoku University, Faculty of Science, 1921.
MLA-referens (8:e uppl.)Não informado. Science Reports of the Tohoku University. Tohoku University, Faculty of Science, 1921.
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