@article{1195518830,
author = {Taira, Kazuaki},
title = {Hypoelliptic differential operators with double characteristics},
journal = {Proc. Japan Acad.},
volume = {50},
number = {1},
year = {1974},
pages = { 546-548},
language = {en},
url = {http://dml.mathdoc.fr/item/1195518830}
}
Taira, Kazuaki. Hypoelliptic differential operators with double characteristics. Proc. Japan Acad., Tome 50 (1974) no. 1, pp. 546-548. http://gdmltest.u-ga.fr/item/1195518830/