@article{SM_1975_27_3_a6,
     author = {S. N. Kruzhkov},
     title = {Generalized solutions of the {Hamilton--Jacobi} equations of eikonal type. {I.~Formulation} of the problems; existence, uniqueness and stability theorems; some properties of the solutions},
     journal = {Sbornik. Mathematics},
     pages = {406--446},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_27_3_a6/}
}