@article{SM_1970_10_2_a5,
     author = {S. N. Kruzhkov},
     title = {First order quasilinear equations in several independent variables},
     journal = {Sbornik. Mathematics},
     pages = {217--243},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_10_2_a5/}
}