Onishchuk VA, Sysak YP. Local nilpotent groups satisfying a weak condition of minimality or maximality for subgroups of fixed degree of nilpotency . Ukr. Mat. Zhurn. [Internet]. 1992Apr.2 [cited 2024Nov.24];44(3):384-9. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8107