@article{GDZPPN002072831, title = {Die Steinersche Hypozykloide.}, journal = {Elemente der Mathematik}, volume = {5}, year = {1950}, pages = {55-60}, zbl = {0036.22206}, url = {http://dml.mathdoc.fr/item/GDZPPN002072831} }
Stoll, A. Die Steinersche Hypozykloide.. Elemente der Mathematik, Tome 5 (1950) pp. 55-60. http://gdmltest.u-ga.fr/item/GDZPPN002072831/