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@article{MZ_1972__125_171713, author = {Birger Iversen}, title = {On the {Exceptional} {Tangents} to a {Smooth,} {Plane} {Curve.}}, journal = {Mathematische Zeitschrift}, pages = {359--360}, publisher = {mathdoc}, volume = {125}, year = {1972}, zbl = {0232.14012}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171713/} }
Birger Iversen. On the Exceptional Tangents to a Smooth, Plane Curve.. Mathematische Zeitschrift, Tome 125 (1972), pp. 359-360. http://geodesic.mathdoc.fr/item/MZ_1972__125_171713/