@article{CMH_1981__56_139878,
     author = {Joe Brandenburg and M. Dyer},
     title = {On {J.H.C.} {Whitehead's} aspherical question {I.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {431--446},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0499.57004},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139878/}
}