Existence of solutions of nonlinear hyperbolic equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 6 (1979) no. 4, pp. 573-592.
corrigé par Errata-Corrige : “Existence of solutions of nonlinear hyperbolic equations” 
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     title = {Existence of solutions of nonlinear hyperbolic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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Cesari, L.; Kannan, R. Existence of solutions of nonlinear hyperbolic equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 6 (1979) no. 4, pp. 573-592. http://www.numdam.org/item/ASNSP_1979_4_6_4_573_0/

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