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@article{TM_1976_140_a6, author = {G. G. Kazaryan}, title = {Estimates of differential operators, and hypoelliptic operators}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {130--161}, publisher = {mathdoc}, volume = {140}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1976_140_a6/} }
G. G. Kazaryan. Estimates of differential operators, and hypoelliptic operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 6, Tome 140 (1976), pp. 130-161. http://geodesic.mathdoc.fr/item/TM_1976_140_a6/