The Search for Simple Symmetric Venn Diagrams. Notices of the AMS, joulukuu 2006, 53. vsk, nro 11, s. 1304–1311. Artikkelin verkkoversio. (PDF)
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On the employment of geometrical diagrams for the sensible representations of logical propositions. Proceedings of the Cambridge Philosophical Society, 1880, 4. vsk, s. 47–59. Artikkelin verkkoversio.
