@article{ASNSP_1996_4_23_3_483_0, author = {Citti, G.}, title = {$C^\infty $ regularity of solutions of a quasilinear equation related to the Levi operator}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {483--529}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 23}, number = {3}, year = {1996}, zbl = {0872.35018}, language = {en}, url = {archive.numdam.org/item/ASNSP_1996_4_23_3_483_0/} }
Citti, G. $C^\infty $ regularity of solutions of a quasilinear equation related to the Levi operator. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 23 (1996) no. 3, pp. 483-529. http://archive.numdam.org/item/ASNSP_1996_4_23_3_483_0/
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