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jstor.org
Wishart, J «The generalised product moment distribution in samples from a normal multivariate population». Biometrika, 20A, (1 - 2), 1928, pàg. 32 - 52. DOI: 10.1093/biomet/20A.1-2.32. JSTOR: 2331939.
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Pearson, K.; Jeffery, G. B.; Elderton, E. M «On the Distribution of the First Product Moment-Coefficient, in Samples Drawn from an Indefinitely Large Normal Population». Biometrika, 21, 1929, pàg. 164 - 201. DOI: 10.2307/2332556. JSTOR: 2332556.
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