Formation of Singularities for Quasilinear Hyperbolic Systems with Characteristics with Constant Multiplicity. Journal of Partial Differential Equations, [S. l.], v. 18, n. 4, p. 355–370, 2020. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/4059. Acesso em: 5 dec. 2025.