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@article{MAN_1983__264_163786, author = {Charles M. Stanton}, title = {A {Characterization} of the {Ball} by its {Intrinsic} {Metrics.}}, journal = {Mathematische Annalen}, pages = {271--276}, publisher = {mathdoc}, volume = {264}, year = {1983}, zbl = {0501.32002}, url = {http://geodesic.mathdoc.fr/item/MAN_1983__264_163786/} }
Charles M. Stanton. A Characterization of the Ball by its Intrinsic Metrics.. Mathematische Annalen, Tome 264 (1983), pp. 271-276. http://geodesic.mathdoc.fr/item/MAN_1983__264_163786/