Não informado. (1950). Science Reports of the Research Institutes. Tohoku University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Science Reports of the Research Institutes. Sendai, Japão: Tohoku University, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Science Reports of the Research Institutes. Tohoku University, 1950.
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