On the Cauchy Problem for a Class of Semilinear Hyperbolic Equations with Discontinuous Coefficients and Data. Journal of Partial Differential Equations, [S. l.], v. 9, n. 3, p. 209–220, 1996. Disponível em: https://global-sci.com/index.php/jpde/article/view/3827. Acesso em: 6 dec. 2025.