@article{SM_1967_1_1_a5,
     author = {S. N. Kruzhkov},
     title = {Generalized solutions of nonlinear first order equations with},
     journal = {Sbornik. Mathematics},
     pages = {93--116},
     year = {1967},
     volume = {1},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_1_1_a5/}
}