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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
. 1916 Apr;2(4):248–252. doi: 10.1073/pnas.2.4.248

Interpretation of the Simplest Integral Invariant of Projective Geometry

E J Wilczynski 1
PMCID: PMC1090997  PMID: 16586621

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