@article{GDZPPN002445662,
title = {Global solvability for certain classes of underdetermined systems of vector fields.},
journal = {Mathematische Zeitschrift},
volume = {221},
year = {1996},
pages = {261-274},
zbl = {0863.58062},
url = {http://dml.mathdoc.fr/item/GDZPPN002445662}
}
Bergamasco, A.P.; Cordaro, P.D.; Petronilho, G. Global solvability for certain classes of underdetermined systems of vector fields.. Mathematische Zeitschrift, Tome 221 (1996) pp. 261-274. http://gdmltest.u-ga.fr/item/GDZPPN002445662/