@article{ASNSP_1979_4_6_4_573_0,
     author = {Cesari, L. and Kannan, R.},
     title = {Existence of solutions of nonlinear hyperbolic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {573--592},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 6},
     number = {4},
     year = {1979},
     mrnumber = {563335},
     zbl = {0434.35060},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1979_4_6_4_573_0/}
}