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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
. 1957 Jan 15;43(1):169–172. doi: 10.1073/pnas.43.1.169

ON DEHN'S LEMMA AND THE ASPHERICITY OF KNOTS

C D Papakyriakopoulos 1
PMCID: PMC528404  PMID: 16589993

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