@article{DAN_1962_146_6_a1,
     author = {V. V. Grushin},
     title = {A problem in the entire space for a certain class of partial differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1251--1254},
     publisher = {mathdoc},
     volume = {146},
     number = {6},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_6_a1/}
}