Não informado. (1903). Colloquium lectures of the American Mathematical Society. American Mathematical Society.
Chicago-referens (17:e uppl.)Não informado. Colloquium Lectures of the American Mathematical Society. New York: American Mathematical Society, 1903.
MLA-referens (8:e uppl.)Não informado. Colloquium Lectures of the American Mathematical Society. American Mathematical Society, 1903.
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