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@article{MAN_1952__125_160325, author = {S. Verblunsky}, title = {On the curvature of level curves.}, journal = {Mathematische Annalen}, pages = {472--476}, publisher = {mathdoc}, volume = {125}, year = {1952}, zbl = {0051.06003}, url = {http://geodesic.mathdoc.fr/item/MAN_1952__125_160325/} }
S. Verblunsky. On the curvature of level curves.. Mathematische Annalen, Tome 125 (1952), pp. 472-476. http://geodesic.mathdoc.fr/item/MAN_1952__125_160325/