BURSKII, V. P. On the Third Boundary-Value Problem for an Improperly Elliptic Equation in a Disk. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 2, p. 279–283, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2130. Acesso em: 5 dec. 2025.