@article{GDZPPN002087243, title = {Wall Obstruction of a Fibration.}, journal = {Inventiones mathematicae}, volume = {5}, year = {1968}, pages = {67-77}, zbl = {0159.53602}, url = {http://dml.mathdoc.fr/item/GDZPPN002087243} }
LAL, V.J. Wall Obstruction of a Fibration.. Inventiones mathematicae, Tome 5 (1968) pp. 67-77. http://gdmltest.u-ga.fr/item/GDZPPN002087243/