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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
. 1923 Mar;9(3):93–95. doi: 10.1073/pnas.9.3.93

A Lemma on Systems of Knotted Curves

J W Alexander 1
PMCID: PMC1085274  PMID: 16576674

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