ZORII, N. V. Equilibrium Problems for Potentials with External Fields. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 10, p. 1315–1339, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4005. Acesso em: 11 apr. 2025.