Mel’nikT. I. “Varieties of Groups With Invariant Centralizers of Subgroups”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 4 (April 25, 2002): 483-491. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4086.