@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/