@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://www.numdam.org/item/CM_1956-1958__13__270_0/}
}