[1]
M. M. Piskun and N. N. Semko, “On some generalizations of nearly normal subgroups”,
Ukr. Mat. Zhurn.
, vol. 61, no. 10, pp. 1381–1395, Oct. 2009, Accessed: Apr. 13, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/3108