@article{DAN_1990_311_2_a17,
     author = {N. E. Ershov and S. I. Smagin},
     title = {Solution of three-dimensional stationary problems of diffraction},
     journal = {Doklady Akademii Nauk},
     pages = {339--342},
     publisher = {mathdoc},
     volume = {311},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_2_a17/}
}