Konietschke, F., M. Placzek, F. Schaarschmidt, and L. A. Hothorn. “Nparcomp: An R Software Package for Nonparametric Multiple Comparisons and Simultaneous Confidence Intervals”. Journal of Statistical Software, vol. 64, no. 9, Mar. 2015, pp. 1-17, doi:10.18637/jss.v064.i09.