KURDACHENKO, L. A.; KURDACHENKO, L. A.; OTAL, J.; PYPKA, A. A. On some properties of the central and generalized central series of groups . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 1, p. 20–24, 2025. DOI: 10.15407/dopovidi2015.01.020. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/12950. Acesso em: 13 may. 2025.