@article{DAN_1975_225_3_a6,
     author = {V. Yu. Lyapidevskii},
     title = {On correctness classes for nonlinear hyperbolic systems},
     journal = {Doklady Akademii Nauk},
     pages = {507--510},
     publisher = {mathdoc},
     volume = {225},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_3_a6/}
}