@article{DAN_1964_158_2_a3,
     author = {V. V. Grushin},
     title = {Behaviour of solutions of differential equations near the boundary},
     journal = {Doklady Akademii Nauk},
     pages = {264--267},
     publisher = {mathdoc},
     volume = {158},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_2_a3/}
}