Plakhta , L.P. (1992) “Sets of singular points of actions of finite groups by $(S^n)^k$”, Ukrains’kyi Matematychnyi Zhurnal, 44(9), pp. 1233–1238. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8175 (Accessed: 10 April 2025).