1. W.T. Eadie, D. Drijard, F.E. James, M. Roos and B. Sadoulet, Statistical Methods in Experimental Physics, North-Holland, Amsterdam, 1971.
2. S. Siegel, Nonparametric Statistics for the Behavioural Sciences, McGraw-Hill, New York, 1956, pp. 52–58.
3. M. Kendall and A. Stuart, The Advanced Theory of Statistics, 2nd Edition, Vol.3, Griffin, London, 1968, pp. 355–357.
4. ibid. pp. 357–361.
5. ibid. pp. 351–355.