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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
. 1956 Jul;42(7):419–421. doi: 10.1073/pnas.42.7.419

ABSTRACT HOMOTOPY. III

Daniel M Kan 1,2
PMCID: PMC534240  PMID: 16589880

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