@article{DAN_1961_137_4_a2,
     author = {V. V. Grushin},
     title = {A property of the solution of a hypoelliptic equation},
     journal = {Doklady Akademii Nauk},
     pages = {768--771},
     publisher = {mathdoc},
     volume = {137},
     number = {4},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_4_a2/}
}