@article{DAN_1979_247_1_a2,
     author = {V. M. Gol'dstein},
     title = {A criterion for extending functions of one of the {Besov} classes for plane domains},
     journal = {Doklady Akademii Nauk},
     pages = {18--21},
     publisher = {mathdoc},
     volume = {247},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_1_a2/}
}