Não informado. (1922). Journal of Mathematics and Physics. Massachusetts Institute of Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Mathematics and Physics. Cambridge, Mass: Massachusetts Institute of Technology, 1922.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Mathematics and Physics. Massachusetts Institute of Technology, 1922.
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