@article{1195519972,
author = {Kato, Yoshio},
title = {Remarks on hypoellipticity of degenerate parabolic differential operators},
journal = {Proc. Japan Acad.},
volume = {47},
number = {10},
year = {1971},
pages = { 380-384},
language = {en},
url = {http://dml.mathdoc.fr/item/1195519972}
}
Kato, Yoshio. Remarks on hypoellipticity of degenerate parabolic differential operators. Proc. Japan Acad., Tome 47 (1971) no. 10, pp. 380-384. http://gdmltest.u-ga.fr/item/1195519972/