@article{1250520600,
author = {Ninomiya, Haruki},
title = {On a problem of hypoellipticity},
journal = {J. Math. Kyoto Univ.},
volume = {27},
number = {4},
year = {1987},
pages = { 587-595},
language = {en},
url = {http://dml.mathdoc.fr/item/1250520600}
}
Ninomiya, Haruki. On a problem of hypoellipticity. J. Math. Kyoto Univ., Tome 27 (1987) no. 4, pp. 587-595. http://gdmltest.u-ga.fr/item/1250520600/