@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}, pages = {517--534}, publisher = {Gauthier-Villars}, volume = {15}, number = {4}, year = {1998}, zbl = {0921.35033}, language = {en}, url = {http://www.numdam.org/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, Volume 15 (1998) no. 4, pp. 517-534. http://www.numdam.org/item/AIHPC_1998__15_4_517_0/
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