Não informado. (1950). Proceedings of the American Mathematical Society. American Mathematical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the American Mathematical Society. Providence, RI: American Mathematical Society, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the American Mathematical Society. American Mathematical Society, 1950.
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