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@article{10_4064_cm_32_1_77_81, author = {Th. Friedrich}, title = {A characterization of the disc $D^n$}, journal = {Colloquium Mathematicum}, pages = {77--81}, publisher = {mathdoc}, volume = {32}, number = {1}, year = {1974}, doi = {10.4064/cm-32-1-77-81}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-32-1-77-81/} }
Th. Friedrich. A characterization of the disc $D^n$. Colloquium Mathematicum, Tome 32 (1974) no. 1, pp. 77-81. doi : 10.4064/cm-32-1-77-81. http://geodesic.mathdoc.fr/articles/10.4064/cm-32-1-77-81/
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