@article{DAN_1987_295_1_a4,
     author = {Yu. A. Mitropol'skii and M. V. Shul'ga},
     title = {Asymptotic solutions of a multidimensional nonlinear wave equation},
     journal = {Doklady Akademii Nauk},
     pages = {30--33},
     publisher = {mathdoc},
     volume = {295},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_1_a4/}
}