Cauchy Problem for Quasilinear Hyperbolic Systems with Characteristics with Constant Multiplicity. Journal of Partial Differential Equations, [S. l.], v. 17, n. 3, p. 221–240, 2004. Disponível em: https://global-sci.com/index.php/jpde/article/view/4025. Acesso em: 6 dec. 2025.