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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
. 1947 May;33(5):117–123. doi: 10.1073/pnas.33.5.117

An Expression of Hopf's Invariant as an Integral*

J H C Whitehead 1
PMCID: PMC1079004  PMID: 16578254

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