@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/