@article{GDZPPN00205566X, title = {St\"utzfunktion und Radius II.}, journal = {Commentarii mathematici Helvetici}, volume = {25}, year = {1951}, pages = {11-25}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN00205566X} }
Scherrer, W. Stützfunktion und Radius II.. Commentarii mathematici Helvetici, Tome 25 (1951) pp. 11-25. http://gdmltest.u-ga.fr/item/GDZPPN00205566X/