KURDACHENKO, L. A.; PYPKA, A. A.; SEMKO, N. N. Periodic groups, whose cyclic subgroups either are ascendant or almost self-normalized . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 10, p. 17–20, 2025. DOI: 10.15407/dopovidi2015.10.017. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/15350. Acesso em: 10 may. 2026.