Geodesic
On the definition of hypo-elliptic equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 5 
E. A. Gorin; V. V. Grushin. On the definition of hypo-elliptic equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 5. http://geodesic.mathdoc.fr/item/RM_1961_16_5_a4/
@article{RM_1961_16_5_a4,
     author = {E. A. Gorin and V. V. Grushin},
     title = {On the definition of hypo-elliptic equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1961},
     volume = {16},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_5_a4/}
}
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