MALYSHEV, P. V. Approximation by Finite Potentials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 10, p. 1342–1349, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2513. Acesso em: 6 dec. 2025.