Geodesic
Real Hypersurfaces in Complex Two-Plane Grassmannians with Generalized Tanaka–Webster Invariant Shape Operator
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 9 (2013) no. 3, pp. 360-378 
I. Jeong; E. Pak; Y. J. Suh. Real Hypersurfaces in Complex Two-Plane Grassmannians with Generalized Tanaka–Webster Invariant Shape Operator. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 9 (2013) no. 3, pp. 360-378. http://geodesic.mathdoc.fr/item/JMAG_2013_9_3_a4/
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     author = {I. Jeong and E. Pak and Y. J. Suh},
     title = {Real {Hypersurfaces} in {Complex} {Two-Plane} {Grassmannians} with {Generalized} {Tanaka{\textendash}Webster} {Invariant} {Shape} {Operator}},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper, we introduce a new notion of the generalized Tanaka–Webster invariant for a hypersurface $M$ in $G_2(\mathbb{C}^{m+2})$, and give a non-existence theorem for Hopf hypersurfaces in $G_2(\mathbb{C}^{m+2})$ with generalized Tanaka–Webster invariant shape operator.

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