@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://www.numdam.org/item/CM_1937__4__276_0/}
}