@article{SM_1991_70_1_a7,
     author = {V. Zh. Dumanyan},
     title = {On the uniform quasiasymptotics of the solutions of hyperbolic equations},
     journal = {Sbornik. Mathematics},
     pages = {109--128},
     year = {1991},
     volume = {70},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1991_70_1_a7/}
}