ZORII, N. V. Equilibrium Potentials with External Fields. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 9, p. 1178–1195, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3991. Acesso em: 5 dec. 2025.