@article{ASENS_2008_4_41_2_177_0,
     author = {Colombini, Ferruccio and M\'etivier, Guy},
     title = {The {Cauchy} problem for wave equations with non {Lipschitz} coefficients; {Application} to continuation of solutions of some nonlinear wave equations},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {177--220},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {Ser. 4, 41},
     number = {2},
     year = {2008},
     doi = {10.24033/asens.2066},
     mrnumber = {2468481},
     zbl = {1172.35041},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.2066/}
}