@article{ZVMMF_1975_15_3_a24,
     author = {Yu. N. Drozhzhinov and N. I. Koslov},
     title = {Asymptotic behaviour of the solution of the wave equation with a piecewise-discontinuous coefficient},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {782--785},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1975_15_3_a24/}
}