HIROSAWA, F.; REISSIG, M. About the optimality of oscillations in non-Lipschitz coefficients for strictly hyperbolic equations. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 3, n. 3, p. 589-608, 2009. DOI: 10.2422/2036-2145.2004.3.05. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/49. Acesso em: 28 may. 2025.