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@article{ARM_1979__15_3_a5, author = {Svoboda, Karel}, title = {Contribution to the characterization of the sphere in $E^3$}, journal = {Archivum mathematicum}, pages = {171--177}, publisher = {mathdoc}, volume = {15}, number = {3}, year = {1979}, mrnumber = {562341}, zbl = {0435.53003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1979__15_3_a5/} }
Svoboda, Karel. Contribution to the characterization of the sphere in $E^3$. Archivum mathematicum, Tome 15 (1979) no. 3, pp. 171-177. http://geodesic.mathdoc.fr/item/ARM_1979__15_3_a5/