Semenchuk, V. N. “Minimal Nonsupersolvable and Minimum Nonnilpotent Groups and Their Role in the Study of the Structure of Finite Groups”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 69, no. 8, Aug. 2017, pp. 1141-4, https://umj.imath.kiev.ua/index.php/umj/article/view/1764.