@article{GDZPPN002110962, title = {A radius sphere theorem.}, journal = {Inventiones mathematicae}, volume = {114}, year = {1993}, pages = {577-584}, zbl = {0801.53029}, url = {http://dml.mathdoc.fr/item/GDZPPN002110962} }
Grove, Karsten; Petersen, Peter. A radius sphere theorem.. Inventiones mathematicae, Tome 114 (1993) pp. 577-584. http://gdmltest.u-ga.fr/item/GDZPPN002110962/