KOLOS, I.; KOLOS, M. Solvability of the generalized Dirichlet problem for hyperbolic equations. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 3, n. 3, p. 161–171, 2002. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/56. Acesso em: 23 apr. 2024.