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@article{MZ_1989__201_4_174029, author = {Masafumi Yoshino}, title = {A {Class} of {Globally} {Hypoelliptic} {Operators} on the {Torus.}}, journal = {Mathematische Zeitschrift}, pages = {1--12}, publisher = {mathdoc}, volume = {201}, number = {4}, year = {1989}, zbl = {0644.35027}, url = {http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174029/} }
Masafumi Yoshino. A Class of Globally Hypoelliptic Operators on the Torus.. Mathematische Zeitschrift, Tome 201 (1989) no. 4, pp. 1-12. http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174029/