@article{SM_1984_48_1_a11,
     author = {V. U. Lyapidevskii},
     title = {A~mixed problem for a nonhomogeneous quasilinear hyperbolic system of equations},
     journal = {Sbornik. Mathematics},
     pages = {201--210},
     year = {1984},
     volume = {48},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1984_48_1_a11/}
}