@article{AIHPA_1981__34_1_65_0,
     author = {Ruggeri, Tommaso and Strumia, Alberto},
     title = {Main field and convex covariant density for quasi-linear hyperbolic systems : relativistic fluid dynamics},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {65--84},
     publisher = {Gauthier-Villars},
     volume = {34},
     number = {1},
     year = {1981},
     mrnumber = {605357},
     zbl = {0473.76126},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1981__34_1_65_0/}
}