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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
. 1955 Dec 15;41(12):1092–1096. doi: 10.1073/pnas.41.12.1092

ABSTRACT HOMOTOPY

Daniel M Kan 1
PMCID: PMC528202  PMID: 16589801

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