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@article{CM_1937__4__276_0, author = {Whitney, Hassler}, title = {On regular closed curves in the plane}, journal = {Compositio Mathematica}, pages = {276--284}, publisher = {Johnson Reprint Corporation}, volume = {4}, year = {1937}, zbl = {0016.13804}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1937__4__276_0/} }
Whitney, Hassler. On regular closed curves in the plane. Compositio Mathematica, Tome 4 (1937), pp. 276-284. http://geodesic.mathdoc.fr/item/CM_1937__4__276_0/