no. 3
Propagation of analyticity of the solutions to the Cauchy problem for nonlinear symmetrizable systems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 3, pp. 471-487. 
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     author = {Kajitani, Kunihiko and Yamaguti, Kaoru},
     title = {Propagation of analyticity of the solutions to the {Cauchy} problem for nonlinear symmetrizable systems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {471--487},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 28},
     number = {3},
     year = {1999},
     mrnumber = {1736525},
     zbl = {0940.35128},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1999_4_28_3_471_0/}
}
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Kajitani, Kunihiko; Yamaguti, Kaoru. Propagation of analyticity of the solutions to the Cauchy problem for nonlinear symmetrizable systems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 3, pp. 471-487. http://www.numdam.org/item/ASNSP_1999_4_28_3_471_0/

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