no. 2
Some remarks on conservative symmetric-hyperbolic systems governing relativistic theories
Annales de l'I.H.P. Physique théorique, Tome 38 (1983) no. 2, pp. 113-120 
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     author = {Strumia, Alberto},
     title = {Some remarks on conservative symmetric-hyperbolic systems governing relativistic theories},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {113--120},
     year = {1983},
     publisher = {Gauthier-Villars},
     volume = {38},
     number = {2},
     mrnumber = {705335},
     zbl = {0522.76129},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1983__38_2_113_0/}
}
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Strumia, Alberto. Some remarks on conservative symmetric-hyperbolic systems governing relativistic theories. Annales de l'I.H.P. Physique théorique, Tome 38 (1983) no. 2, pp. 113-120. https://www.numdam.org/item/AIHPA_1983__38_2_113_0/

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[2] T. Ruggeri, Entropy principle and main field for a non linear covariant system, to appear in the lecture notes of the first C. I. M. E. session on « Wave propagation », Bressanone, 1980;

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