@article{GDZPPN00223629X, title = {Diameter bounds for convex surfaces with pinched mean curvature.}, journal = {Manuscripta mathematica}, volume = {86}, year = {1995}, pages = {15-22}, zbl = {0821.53004}, url = {http://dml.mathdoc.fr/item/GDZPPN00223629X} }
Lang, Urs. Diameter bounds for convex surfaces with pinched mean curvature.. Manuscripta mathematica, Tome 86 (1995) pp. 15-22. http://gdmltest.u-ga.fr/item/GDZPPN00223629X/