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@article{CM_1956-1958__13__270_0, author = {Griffin, Jr, John S.}, title = {On the rotation number of a normal curve}, journal = {Compositio Mathematica}, pages = {270--276}, publisher = {Kraus Reprint}, volume = {13}, year = {1956-1958}, mrnumber = {117717}, zbl = {0090.13105}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1956-1958__13__270_0/} }
Griffin, Jr, John S. On the rotation number of a normal curve. Compositio Mathematica, Tome 13 (1956-1958), pp. 270-276. http://geodesic.mathdoc.fr/item/CM_1956-1958__13__270_0/