SKRYPNYK, V. I. Periodic Coulomb dynamics of two equal negative charges in the field of six equal positive fixed charges. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 12, p. 1682–1696, 2020. DOI: 10.37863/umzh.v72i12.917. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/917. Acesso em: 7 apr. 2025.