@article{1195519402,
author = {Tsutsumi, Akira},
title = {A remark on a sufficient condition for hypoellipticity},
journal = {Proc. Japan Acad.},
volume = {49},
number = {9},
year = {1973},
pages = { 187-190},
language = {en},
url = {http://dml.mathdoc.fr/item/1195519402}
}
Tsutsumi, Akira. A remark on a sufficient condition for hypoellipticity. Proc. Japan Acad., Tome 49 (1973) no. 9, pp. 187-190. http://gdmltest.u-ga.fr/item/1195519402/