COLOMBINI, F.; NISHITANI, T.; RAUCH, J. Weakly hyperbolic systems by symmetrization. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 19, n. 1, p. 217-251, 2019. DOI: 10.2422/2036-2145.201610_006. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/634. Acesso em: 16 feb. 2025.