@article{GDZPPN002323923,
title = {A Characterization of the Ball by its Intrinsic Metrics.},
journal = {Mathematische Annalen},
volume = {264},
year = {1983},
pages = {271-276},
zbl = {0501.32002},
url = {http://dml.mathdoc.fr/item/GDZPPN002323923}
}
Stanton, Charles M. A Characterization of the Ball by its Intrinsic Metrics.. Mathematische Annalen, Tome 264 (1983) pp. 271-276. http://gdmltest.u-ga.fr/item/GDZPPN002323923/