@article{MZ_1922__13_167699,
     author = {F. Apt},
     title = {Die {Tangentenlosigkeit} der von {Kochschen} {Kurve}},
     journal = {Mathematische Zeitschrift},
     pages = {217--222},
     publisher = {mathdoc},
     volume = {13},
     year = {1922},
     zbl = {48.0271.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1922__13_167699/}
}