Geodesic
A~characterization of hypoellipticity by estimates from below
Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 6, Tome 140 (1976), pp. 162-168.

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     author = {G. G. Kazaryan},
     title = {A~characterization of hypoellipticity by estimates from below},
     journal = {Informatics and Automation},
     pages = {162--168},
     publisher = {mathdoc},
     volume = {140},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1976_140_a7/}
}
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G. G. Kazaryan. A~characterization of hypoellipticity by estimates from below. Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 6, Tome 140 (1976), pp. 162-168. http://geodesic.mathdoc.fr/item/TRSPY_1976_140_a7/