@article{1077466820,
author = {Huebsch, William},
title = {Covering homotopy},
journal = {Duke Math. J.},
volume = {23},
number = {1},
year = {1956},
pages = { 281-291},
language = {en},
url = {http://dml.mathdoc.fr/item/1077466820}
}
Huebsch, William. Covering homotopy. Duke Math. J., Tome 23 (1956) no. 1, pp. 281-291. http://gdmltest.u-ga.fr/item/1077466820/