@article{DAN_1975_222_2_a1,
     author = {Yu. A. Dubinskii},
     title = {Sobolev spaces of infinite order on the torus and some questions in the theory of periodic solutions of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {269--272},
     publisher = {mathdoc},
     volume = {222},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_2_a1/}
}