Chernikov S. N. and Chernikov N. S. (1992) “Complementability criterion of periodical almost soluble subgroups in the group containing it”, Ukrains’kyi Matematychnyi Zhurnal, 44(6), pp. 822-826. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8016 (Accessed: 27July2024).