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IX.—Essentially Contested Concepts W. B. Gallie W. B. Gallie Search for other works by this author on: Oxford Academic Google Scholar Proceedings of the Aristotelian Society, Volume 56, Issue 1, 1 June 1956, Pages 167–198, https://doi.org/10.1093/aristotelian/56.1.167 Published: 21 July 2015
W. B. Gallie (Fri,) studied this question.