Hirosawa, F. and Reissig, M. 2009. About the optimality of oscillations in non-Lipschitz coefficients for strictly hyperbolic equations. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE. 3, 3 (Dec. 2009), 589-608. DOI:https://doi.org/10.2422/2036-2145.2004.3.05.