@article{05174691,
title = {Function classes defined from local approximations by solutions to hypoelliptic equations.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {47},
year = {2006},
pages = {394-413},
zbl = {1115.35033},
language = {en},
url = {http://dml.mathdoc.fr/item/05174691}
}
Pokrovskii, A.V. Function classes defined from local approximations by solutions to hypoelliptic equations.. Sibirskij Matematicheskij Zhurnal, Tome 47 (2006) pp. 394-413. http://gdmltest.u-ga.fr/item/05174691/