Não informado. (1927). Colloquium Publications of the American Mathematical Society. American Mathematical Society.
Chicago-referens (17:e uppl.)Não informado. Colloquium Publications of the American Mathematical Society. Providence, RI: American Mathematical Society, 1927.
MLA-referens (8:e uppl.)Não informado. Colloquium Publications of the American Mathematical Society. American Mathematical Society, 1927.
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