2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74781We propose a proof of the characterization of spherical hypersurfaces as the only strictly pseudoconvex hypersurfaces which have contracting germs of diffeomorphisms. Unlike previous proofs, our approach does not use Chern-Moser theory. It only relies on Pinchuk dilation techniques. We also give some applications of this result.16 pages, 3 figures, FrancaisComplex Variables32V15, 32T15, 37F25text