@article{DAN_1980_251_2_a7,
     author = {A. V. Romanov},
     title = {The {Neumann} method in boundary value problems for the {Helmholtz} equation},
     journal = {Doklady Akademii Nauk},
     pages = {288--291},
     publisher = {mathdoc},
     volume = {251},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_251_2_a7/}
}