hal-00264969 title_s Isometric Immersions of Hypersurfaces in 4-dimensional Manifolds via Spinors auteur Marie-Amélie Lawn, Julien Roth journal Differential Geometry and its Applications volume 28 numero 2 pages 205-219 fichier_hal https://hal.archives-ouvertes.fr/hal-00264969/document annee 2010 Identifiant HAL 296292 220314