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Journal Article I. On the Surface of Constant Association Q = 0.6 Get access KARL PEARSON, F.R.S. KARL PEARSON, F.R.S. Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 9, Issue 3-4, October 1913, Pages 534–537, https://doi.org/10.1093/biomet/9.3-4.534 Published: 01 October 1913
K. PEARSON (Wed,) studied this question.