PYPKA, A.; STOROZHENKO, D. On some types of propermutable subgroups and their generalizations in finite groups . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 7, p. 18–20, 2024. DOI: 10.15407/dopovidi2017.07.018. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/7674. Acesso em: 18 apr. 2026.