@article{CMH_1992__67_3_140263, author = {A. El Soufi and S. Ilias}, title = {Une in\'egalit\'e du type }, journal = {Commentarii mathematici Helvetici}, pages = {167--181}, publisher = {mathdoc}, volume = {67}, number = {3}, year = {1992}, url = {http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140263/} }