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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1917 Mar;3(3):197–199. doi: 10.1073/pnas.3.3.197

The Complete Enumeration of Triad Systems in 15 Elements

F N Cole, Louise D Cummings, H S White
PMCID: PMC1091209  PMID: 16576216

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