@article{DE_2003_39_5_a9,
     author = {S. I. Pokhozhaev},
     title = {On {Hyperbolic} {Systems} of {Conservation} {Laws}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {663--673},
     publisher = {mathdoc},
     volume = {39},
     number = {5},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_5_a9/}
}