@article{GDZPPN00244593X,
title = {Hypersurfaces with constant inner curvature of the second fundamental form, and the non-rigidity of the sphere.},
journal = {Mathematische Zeitschrift},
volume = {221},
year = {1996},
pages = {693-708},
zbl = {0869.53003},
url = {http://dml.mathdoc.fr/item/GDZPPN00244593X}
}
Kühnel, Wolfgang; Becker, Markus. Hypersurfaces with constant inner curvature of the second fundamental form, and the non-rigidity of the sphere.. Mathematische Zeitschrift, Tome 221 (1996) pp. 693-708. http://gdmltest.u-ga.fr/item/GDZPPN00244593X/