@article{1195514371,
author = {Morimoto, Yoshinori},
title = {On a criterion for hypoellipticity},
journal = {Proc. Japan Acad. Ser. A Math. Sci.},
volume = {62},
number = {6},
year = {1986},
pages = { 137-140},
language = {en},
url = {http://dml.mathdoc.fr/item/1195514371}
}
Morimoto, Yoshinori. On a criterion for hypoellipticity. Proc. Japan Acad. Ser. A Math. Sci., Tome 62 (1986) no. 6, pp. 137-140. http://gdmltest.u-ga.fr/item/1195514371/