@article{GDZPPN002072882, title = {Die Steinersche Hypozykloide. II.}, journal = {Elemente der Mathematik}, volume = {5}, year = {1950}, pages = {73-78}, zbl = {0037.21902}, url = {http://dml.mathdoc.fr/item/GDZPPN002072882} }
Stoll, A. Die Steinersche Hypozykloide. II.. Elemente der Mathematik, Tome 5 (1950) pp. 73-78. http://gdmltest.u-ga.fr/item/GDZPPN002072882/