NIKITINA, N. On motions in a small neighborhood of zero of a multidimensional system . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 6, p. 49–57, 2024. DOI: 10.15407/dopovidi2018.06.049. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2803. Acesso em: 1 oct. 2024.