@article{1077489917, author = {Whitney, Hassler}, title = {The maps of an $n$ -complex into an $n$ -sphere}, journal = {Duke Math. J.}, volume = {3}, number = {1}, year = {1937}, pages = { 51-55}, language = {en}, url = {http://dml.mathdoc.fr/item/1077489917} }
Whitney, Hassler. The maps of an $n$ -complex into an $n$ -sphere. Duke Math. J., Tome 3 (1937) no. 1, pp. 51-55. http://gdmltest.u-ga.fr/item/1077489917/