@article{CM_1938__5__284_0, author = {Samelson, Hans}, title = {\"Uber die Drehung der Tangenten offener ebener Kurven}, journal = {Compositio Mathematica}, pages = {284--291}, publisher = {Johnson Reprint Corporation}, volume = {5}, year = {1938}, zbl = {0018.03804}, language = {de}, url = {www.numdam.org/item/CM_1938__5__284_0/} }
Samelson, Hans. Über die Drehung der Tangenten offener ebener Kurven. Compositio Mathematica, Tome 5 (1938) , pp. 284-291. http://www.numdam.org/item/CM_1938__5__284_0/