MARYNETZ, V. V. On a mixed problem for systems of definite quasilinear partial differential equations with deviating argument. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 11, p. 1581–1585, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5600. Acesso em: 5 dec. 2025.