hal-01228823 title_s PINCHING OF THE FIRST EIGENVALUE FOR SECOND ORDER OPERATORS ON HYPERSURFACES OF THE EUCLIDEAN SPACE auteur Julien Roth, Julian Scheuer journal Annals of Global Analysis and Geometry volume 51 numero 3 pages 287-304 fichier_hal https://hal.science/hal-01228823/document annee 2017
