@article{ASNSP_2001_4_30_2_251_0,
     author = {d'Ancona, Piero and Di Flaviano, Mariagrazia},
     title = {On a weakly hyperbolic quasilinear mixed problem of second order},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {251--267},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 30},
     number = {2},
     year = {2001},
     mrnumber = {1895711},
     zbl = {1072.35128},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2001_4_30_2_251_0/}
}