VELYCHKO, T. On the structure of some non-periodic groups whose subgroups of infinite special rank are transitively normal. Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 6, p. 12–14, 2021. DOI: 10.15407/dopovidi2021.06.012. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2021-6-2. Acesso em: 18 apr. 2026.