@article{DAN_1969_187_5_a9,
     author = {S. V. Uspenskii},
     title = {The summability (boundedness) of the solutions of a certain class of hypoelliptic equations in unbounded domains},
     journal = {Doklady Akademii Nauk},
     pages = {998--1001},
     publisher = {mathdoc},
     volume = {187},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_5_a9/}
}