@article{1256052718, author = {James, I. M.}, title = {Ex-homotopy theory I}, journal = {Illinois J. Math.}, volume = {15}, number = {4}, year = {1971}, pages = { 324-337}, language = {en}, url = {http://dml.mathdoc.fr/item/1256052718} }
James, I. M. Ex-homotopy theory I. Illinois J. Math., Tome 15 (1971) no. 4, pp. 324-337. http://gdmltest.u-ga.fr/item/1256052718/