@article{DAN_1962_144_6_a1,
     author = {B. A. Vostretsov and M. A. Kreines},
     title = {Approximation of a plane wave by superpositions of plane waves with given directions},
     journal = {Doklady Akademii Nauk},
     pages = {1212--1214},
     publisher = {mathdoc},
     volume = {144},
     number = {6},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_6_a1/}
}