@article{GDZPPN002350343,
title = {Partial Hypoellipticity and Gevrey Classes.},
journal = {Mathematica Scandinavica},
volume = {27},
year = {1970},
pages = {119-131},
zbl = {0201.12502},
url = {http://dml.mathdoc.fr/item/GDZPPN002350343}
}
Claesson, Tomas. Partial Hypoellipticity and Gevrey Classes.. Mathematica Scandinavica, Tome 27 (1970) pp. 119-131. http://gdmltest.u-ga.fr/item/GDZPPN002350343/