Onishchuk V. A. and Sysak Y. P. (1992) “Local nilpotent groups satisfying a weak condition of minimality or maximality for subgroups of fixed degree of nilpotency ”, Ukrains’kyi Matematychnyi Zhurnal, 44(3), pp. 384-389. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8107 (Accessed: 24November2024).