SKRYPNIK, W. I. Mechanical systems with singular equilibria and the Coulomb dynamics of three charges. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 4, p. 519–533, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1573. Acesso em: 5 dec. 2025.