@article{DAN_1975_222_1_a3,
     author = {Yu. A. Dubinskii},
     title = {On nonlinear elliptic equations of infinite order and the nontriviality of the corresponding {Sobolev} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {22--25},
     publisher = {mathdoc},
     volume = {222},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_1_a3/}
}