@article{GDZPPN002410702, title = {On the Exceptional Tangents to a Smooth, Plane Curve.}, journal = {Mathematische Zeitschrift}, volume = {129}, year = {1972}, pages = {359-360}, zbl = {0232.14012}, url = {http://dml.mathdoc.fr/item/GDZPPN002410702} }
Iversen, Birger. On the Exceptional Tangents to a Smooth, Plane Curve.. Mathematische Zeitschrift, Tome 129 (1972) pp. 359-360. http://gdmltest.u-ga.fr/item/GDZPPN002410702/