1. Snedecor, G.W. & Cochran, W.G. Statistical Methods 8th edn. (Iowa State Univ. Press, 1989).
2. Fisher, R.A. J. R. Stat. Soc. Ser. A 85, 87–94 (1922).
3. Pearson, K. Philosophical Magazine 50, 157–175 (1900).
4. Bishop, Y.M.M., Fienberg, S.E. & Holland, P.W. Discrete Multivariate Analysis (MIT Press, 1975).
5. Dialsingh, I., Austin, S. & Altman, N.S. Bioinformatics 31, 2303–2309 (2015).