@article{1255455733, author = {Hermann, Robert}, title = {Obstruction theory for fibre spaces}, journal = {Illinois J. Math.}, volume = {4}, number = {1}, year = {1960}, pages = { 9-27}, language = {en}, url = {http://dml.mathdoc.fr/item/1255455733} }
Hermann, Robert. Obstruction theory for fibre spaces. Illinois J. Math., Tome 4 (1960) no. 1, pp. 9-27. http://gdmltest.u-ga.fr/item/1255455733/