@article{1077471790, author = {Civin, Paul}, title = {Two-to-one mappings of manifolds}, journal = {Duke Math. J.}, volume = {10}, number = {1}, year = {1943}, pages = { 49-57}, language = {en}, url = {http://dml.mathdoc.fr/item/1077471790} }
Civin, Paul. Two-to-one mappings of manifolds. Duke Math. J., Tome 10 (1943) no. 1, pp. 49-57. http://gdmltest.u-ga.fr/item/1077471790/