TY  - JOUR
AU  - Th. Friedrich
TI  - A characterization of the disc $D^n$
JO  - Colloquium Mathematicum
PY  - 1974
SP  - 77
EP  - 81
VL  - 32
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-32-1-77-81/
DO  - 10.4064/cm-32-1-77-81
LA  - en
ID  - 10_4064_cm_32_1_77_81
ER  -