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@article{MS2_1970__26_166130, author = {Tomas Claesson}, title = {Partial {Hypoellipticity} and {Gevrey} {Classes.}}, journal = {Mathematica Scandinavica}, pages = {119--131}, publisher = {mathdoc}, volume = {26}, year = {1970}, zbl = {0201.12502}, url = {http://geodesic.mathdoc.fr/item/MS2_1970__26_166130/} }
Tomas Claesson. Partial Hypoellipticity and Gevrey Classes.. Mathematica Scandinavica, Tome 26 (1970), pp. 119-131. http://geodesic.mathdoc.fr/item/MS2_1970__26_166130/