Não informado. (1940). Annals of Mathematics Studies. Princeton University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Annals of Mathematics Studies. Princeton, NJ: Princeton University Press, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Annals of Mathematics Studies. Princeton University Press, 1940.
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