@article{ZVMMF_1979_19_2_a12,
     author = {A. S. Il'inskii and O. B. Popov},
     title = {On the direct method in problems of diffraction by smooth infinite wavy surfaces in inhomogeneous media},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {426--443},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_2_a12/}
}