no. 2
On a weakly hyperbolic quasilinear mixed problem of second order
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 2, pp. 251-267. 
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     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/}
}
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d'Ancona, Piero; Di Flaviano, Mariagrazia. On a weakly hyperbolic quasilinear mixed problem of second order. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 30 (2001) no. 2, pp. 251-267. http://www.numdam.org/item/ASNSP_2001_4_30_2_251_0/

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