Reflection of Singularities at Boundary for Piecewise Smooth Solutions to Semilinear Hyperbolic Systems. Journal of Partial Differential Equations, [S. l.], v. 2, n. 1, p. 59–70, 1989. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3613. Acesso em: 5 dec. 2025.