@article{ELMA_1972__27_141057,
     author = {J. T\"olke},
     title = {Eine {Kennzeichnung} der sph\"arischen {Trochoidenbewegung.}},
     journal = {Elemente der Mathematik},
     pages = {57--59},
     publisher = {mathdoc},
     volume = {27},
     year = {1972},
     zbl = {0234.53003},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1972__27_141057/}
}