@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/