@article{SM_1969_7_4_a4,
     author = {B. R. Vainberg},
     title = {Behavior of the solution of the {Cauchy} problem for a~hyperbolic equation~$t\to\infty$},
     journal = {Sbornik. Mathematics},
     pages = {533--567},
     year = {1969},
     volume = {7},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_7_4_a4/}
}