@article{1240432560,
author = {MORIMOTO, Yoshinori},
title = {On the hypoellipticity for infinitely degenerate semi-elliptic operators},
journal = {J. Math. Soc. Japan},
volume = {30},
number = {4},
year = {1978},
pages = { 327-358},
language = {en},
url = {http://dml.mathdoc.fr/item/1240432560}
}
MORIMOTO, Yoshinori. On the hypoellipticity for infinitely degenerate semi-elliptic operators. J. Math. Soc. Japan, Tome 30 (1978) no. 4, pp. 327-358. http://gdmltest.u-ga.fr/item/1240432560/