SKRYPNIK, W. I. Coulomb planar periodic motion of equal charges in the field of attractive centers and a constant magnetic field . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 3, p. 19–25, 2024. DOI: 10.15407/dopovidi2016.03.019. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/8596. Acesso em: 18 oct. 2024.