@article{1028999479, author = {Wilder, R. L.}, title = {An elementary property of closed coverings of manifolds}, journal = {Michigan Math. J.}, volume = {13}, number = {1}, year = {1966}, pages = { 49-55}, language = {en}, url = {http://dml.mathdoc.fr/item/1028999479} }
Wilder, R. L. An elementary property of closed coverings of manifolds. Michigan Math. J., Tome 13 (1966) no. 1, pp. 49-55. http://gdmltest.u-ga.fr/item/1028999479/