KURDACHENKO, L.; PYPKA, A.; SUBBOTIN, I. On some reciprocal relations between the factors of the upper and lower central series in Lie algebras . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 5, p. 21–25, 2015. DOI: 10.15407/dopovidi2015.05.021. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/14970. Acesso em: 20 jun. 2026.