1. G. D. Birkhoff & D. C. Lewis Jr (1935). Stability in Causal Systems. Philosophy of Science 2 (3):304-333.
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  2. G. D. Birkhoff (1931). A mathematical Approach to Aesthetics. Scientia 25 (50):133.
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  3. G. D. Birkhoff (1931). L'esthétique abordée par la mathématique. Scientia 25 (50):du Supplém. 49.
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