Geodesic
Some Examples of Nonhypoelliptic Infinitely Degenerate Elliptic Differential Operators
Matematičeskie zametki, Tome 71 (2002) no. 4, pp. 567-580.

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This paper contains examples of nonhypoelliptic infinitely degenerate elliptic differential operators. Global nonsmooth solutions of the corresponding homogeneous equations are constructed. 
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Nguyen Minh Tri. Some Examples of Nonhypoelliptic Infinitely Degenerate Elliptic Differential Operators. Matematičeskie zametki, Tome 71 (2002) no. 4, pp. 567-580. http://geodesic.mathdoc.fr/item/MZM_2002_71_4_a8/

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