Geodesic
The smoothness of $\operatorname{CR}$-mappings between strictly pseudoconvex hypersurfaces
Izvestiya. Mathematics, Tome 35 (1990) no. 2, pp. 457-467 
S. I. Pinchuk; Sh. I. Tsyganov. The smoothness of $\operatorname{CR}$-mappings between strictly pseudoconvex hypersurfaces. Izvestiya. Mathematics, Tome 35 (1990) no. 2, pp. 457-467. http://geodesic.mathdoc.fr/item/IM2_1990_35_2_a8/
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     title = {The smoothness of $\operatorname{CR}$-mappings between strictly pseudoconvex hypersurfaces},
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     volume = {35},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_35_2_a8/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this article it is proved that if $\Gamma_1$, and $\Gamma_2$ are strictly pseudoconvex hypersurfaces in $\mathbf C^n$ of class $C^m$ for ($m>2$) and if $F\colon\Gamma_1\to\Gamma_2$ is a continuous nonconstant $\operatorname{CR}$-mapping, then $F$ is a local diffeomorphism of class $C^{m-1-0}$. Bibliography: 16 titles.

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