@article{TM_2003_243_a18,
     author = {S. I. Pokhozhaev},
     title = {On a~priori {Estimates} and {Gradient} {Catastrophes} of {Smooth} {Solutions} to {Hyperbolic} {Systems} of {Conservation} {Laws}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {257--288},
     year = {2003},
     volume = {243},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2003_243_a18/}
}