@article{GDZPPN00240849X,
title = {Obstruction Theory in Fiber Spaces.},
journal = {Mathematische Zeitschrift},
volume = {121},
year = {1971},
pages = {1-17},
zbl = {0222.55023},
url = {http://dml.mathdoc.fr/item/GDZPPN00240849X}
}
McClendon, James F. Obstruction Theory in Fiber Spaces.. Mathematische Zeitschrift, Tome 121 (1971) pp. 1-17. http://gdmltest.u-ga.fr/item/GDZPPN00240849X/