@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/