@article{1077467621, author = {Lee, C. N.}, title = {Covering spaces and simple connectedness}, journal = {Duke Math. J.}, volume = {24}, number = {1}, year = {1957}, pages = { 547-554}, language = {en}, url = {http://dml.mathdoc.fr/item/1077467621} }
Lee, C. N. Covering spaces and simple connectedness. Duke Math. J., Tome 24 (1957) no. 1, pp. 547-554. http://gdmltest.u-ga.fr/item/1077467621/