MARYNETZ, V. V. Some approaches to the construction of approximate solutions of the generalized Goursat problem for systems of certain quasilinear partial differential equations with deviating argument. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 12, p. 1667–1675, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5560. Acesso em: 11 apr. 2025.