@article{DAN_1981_260_2_a12,
     author = {V. F. Apel'tsin},
     title = {On the nonorthogonal series method in exterior problems of the theory of steady-state oscillations},
     journal = {Doklady Akademii Nauk},
     pages = {310--313},
     publisher = {mathdoc},
     volume = {260},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_2_a12/}
}