Hypoellipticity criteria in terms of power and strength of operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, 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 = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
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     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1979_150_a7/}
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G. G. Kazaryan; V. N. Markaryan. Hypoellipticity criteria in terms of power and strength of operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, 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/TM_1979_150_a7/