@article{AIHPC_1998__15_4_517_0, author = {Citti, G.}, title = {$C^\infty $ regularity of solutions of the Levi equation}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {15}, year = {1998}, pages = {517-534}, zbl = {0921.35033}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1998__15_4_517_0} }
Citti, G. $C^\infty $ regularity of solutions of the Levi equation. Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) pp. 517-534. http://gdmltest.u-ga.fr/item/AIHPC_1998__15_4_517_0/
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