The Distribution of Chi-Square by Edwin B. Wilson and Margaret M. Hilferty (source code)

= The Distribution of Chi-Square by Edwin B. Wilson and Margaret M. Hilferty
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By <Edwin B. Wilson> and <Margaret M. Hilferty>. Proceedings of the National Academy of Sciences 17(12), 684–688 (1931). DOI: https://doi.org/10.1073/pnas.17.12.684

Full text: https://pmc.ncbi.nlm.nih.gov/articles/PMC1076144/

Locator: pp. 684–688, cube-root approximation to the chi-square distribution.