@article{GDZPPN002073080, title = {The Osculating Conics of Steiner`s Hypocycloid.}, journal = {Elemente der Mathematik}, volume = {6}, year = {1951}, pages = {29-30}, zbl = {0042.40201}, url = {http://dml.mathdoc.fr/item/GDZPPN002073080} }
Fabricius-Bjerre, Fr. The Osculating Conics of Steiner`s Hypocycloid.. Elemente der Mathematik, Tome 6 (1951) pp. 29-30. http://gdmltest.u-ga.fr/item/GDZPPN002073080/