@article{GDZPPN002067447, title = {L2 - Curvature pinching.}, journal = {Commentarii mathematici Helvetici}, volume = {65}, year = {1990}, pages = {36-51}, zbl = {0704.53031}, url = {http://dml.mathdoc.fr/item/GDZPPN002067447} }
Ruh, Ernst A.; Min-O, Maung. L2 - Curvature pinching.. Commentarii mathematici Helvetici, Tome 65 (1990) pp. 36-51. http://gdmltest.u-ga.fr/item/GDZPPN002067447/