Geodesic
Strictly hypoelliptic operators with constant coefficients
Sbornik. Mathematics, Tome 75 (1993) no. 1, pp. 265-276

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A class of strictly hypoelliptic operators intermediate between the very broad set of hypoelliptic polynomials and the essentially smaller class of elliptic polynomials is described. 
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     author = {G. G. Kazaryan},
     title = {Strictly hypoelliptic operators with constant coefficients},
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G. G. Kazaryan. Strictly hypoelliptic operators with constant coefficients. Sbornik. Mathematics, Tome 75 (1993) no. 1, pp. 265-276. http://geodesic.mathdoc.fr/item/SM_1993_75_1_a15/