@article{MZ_1971__120_171508,
     author = {James F. McClendon},
     title = {Obstruction {Theory} in {Fiber} {Spaces.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--17},
     publisher = {mathdoc},
     volume = {120},
     year = {1971},
     zbl = {0222.55023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__120_171508/}
}