Geodesic
Conditions for hypo-ellipticity and estimates for the rate of
Doklady Akademii Nauk, Tome 307 (1989) no. 3, pp. 524-526 
A. Yu. Veretennikov. Conditions for hypo-ellipticity and estimates for the rate of. Doklady Akademii Nauk, Tome 307 (1989) no. 3, pp. 524-526. http://geodesic.mathdoc.fr/item/DAN_1989_307_3_a1/
@article{DAN_1989_307_3_a1,
     author = {A. Yu. Veretennikov},
     title = {Conditions for hypo-ellipticity and estimates for the rate of},
     journal = {Doklady Akademii Nauk},
     pages = {524--526},
     year = {1989},
     volume = {307},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_3_a1/}
}
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