@article{DE_2004_40_2_a10,
     author = {G. A. Smolkin},
     title = {A {Priori} {Estimates} {Related} to {Differential} {Operators} of {Kuptsov--H\"ormander} {Type}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {242--250},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_2_a10/}
}