VELIKOIVANENKO, I. M.; LYASHKO, I. I.; MISTETSKY, G. E. Solution in finite-difference stating of boundary value problems for one equation of elliptical type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 2, p. 229–235, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8505. Acesso em: 7 dec. 2025.