@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/