PYPKA, A. On some generalizations of pronormal subgroups . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 6, p. 17–21, 2024. DOI: 10.15407/dopovidi2018.06.017. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2799. Acesso em: 19 jun. 2025.