@article{DAN_1968_181_3_a13,
     author = {S. V. Uspenskii},
     title = {The differential properties of solutions of quasielliptic equations in unbounded domains},
     journal = {Doklady Akademii Nauk},
     pages = {562--564},
     publisher = {mathdoc},
     volume = {181},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_3_a13/}
}