Klyushin, D. A., and Yu. I. Petunin. 2003. “A Nonparametric Test for the Equivalence of Populations Based on a Measure of Proximity of Samples”. Ukrains’kyi Matematychnyi Zhurnal 55 (2), 147-63. https://umj.imath.kiev.ua/index.php/umj/article/view/3897.