Poincaré–Birkhoff theorem (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Poincaré–Birkhoff theorem" in English language version.

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doi.org

  • Birkhoff, George D. (1913). "Proof of Poincare's Geometric Theorem". Transactions of the American Mathematical Society. 14 (1): 14–22. doi:10.2307/1988766.

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