SINAISKII, E. S. Approximation method in problems of potential theory. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 6, p. 773–782, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4472. Acesso em: 27 apr. 2025.