KOLOMIYETS, V. G.; KOMASHINSKAYA, I. V. On the existence of a solution of a quasilinear mixed problem for a quasiwave equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 9, p. 1182–1185, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5116. Acesso em: 5 dec. 2025.