@article{SM_1975_25_1_a8,
     author = {S. I. Pokhozhaev},
     title = {On a~class of quasilinear hyperbolic equations},
     journal = {Sbornik. Mathematics},
     pages = {145--158},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_25_1_a8/}
}