@article{1183529525,
author = {Francis, George K.},
title = {The folded ribbon theorem for regular closed curves in the plane},
journal = {Bull. Amer. Math. Soc.},
volume = {74},
number = {6},
year = {1968},
pages = { 264-267},
language = {en},
url = {http://dml.mathdoc.fr/item/1183529525}
}
Francis, George K. The folded ribbon theorem for regular closed curves in the plane. Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, pp. 264-267. http://gdmltest.u-ga.fr/item/1183529525/