BURSKII, V. P. On the uniqueness of solutions to some boundary-value problems for differential equations in a domain with algebraic boundary. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 7, p. 898–906, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5882. Acesso em: 7 apr. 2025.