Geodesic
Hypoellipticity criteria in terms of power and strength of operators
Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 7, Tome 150 (1979), pp. 128-142.

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     author = {G. G. Kazaryan and V. N. Markaryan},
     title = {Hypoellipticity criteria in terms of power and strength of operators},
     journal = {Informatics and Automation},
     pages = {128--142},
     publisher = {mathdoc},
     volume = {150},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1979_150_a7/}
}
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G. G. Kazaryan; V. N. Markaryan. Hypoellipticity criteria in terms of power and strength of operators. Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 7, Tome 150 (1979), pp. 128-142. http://geodesic.mathdoc.fr/item/TRSPY_1979_150_a7/