@article{DAN_1989_309_6_a16,
     author = {N. A. Gal'chenko},
     title = {A generalized formulation of problems of the diffraction of},
     journal = {Doklady Akademii Nauk},
     pages = {1347--1350},
     publisher = {mathdoc},
     volume = {309},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a16/}
}