KURDACHENKO, L.; PYPKA, A.; SUBBOTIN, I. On the structure of groups, whose subgroups are either normal or core-free . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 4, p. 17–20, 2024. DOI: 10.15407/dopovidi2019.04.017. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2173. Acesso em: 2 nov. 2024.