@article{02217060,
title = {Estimates of the higher order derivatives of the solutions of hypoelliptic equations.},
journal = {Rendiconti del Seminario Matematico},
volume = {61},
year = {2003},
pages = {443-459},
zbl = {1150.35019},
language = {en},
url = {http://dml.mathdoc.fr/item/02217060}
}
Hakobyan, G.H. Estimates of the higher order derivatives of the solutions of hypoelliptic equations.. Rendiconti del Seminario Matematico, Tome 61 (2003) pp. 443-459. http://gdmltest.u-ga.fr/item/02217060/