Não informado. (1949). Science reports of the Tohoku University. Tohoku University, Faculty of Science.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Science Reports of the Tohoku University. Sendai, Japão: Tohoku University, Faculty of Science, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Science Reports of the Tohoku University. Tohoku University, Faculty of Science, 1949.
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