Friedman, Milton (1937) "The use of ranks to avoid the assumption of normality implicit in the analysis of variance", Journal of the American Statistical Association C.32 No.200 say.675–701
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Friedman, Milton (1939) "A correction: The use of ranks to avoid the assumption of normality implicit in the analysis of variance" Journal of the American Statistical Association C.34 No.109 say.109 [2]
Friedman, Milton (1940) "A comparison of alternative tests of significance for the problem of m rankings", The Annals of Mathematical Statistics C.11 No.1 say.86–92
[3]
