%0 Journal Article %A Joe Brandenburg %A M. Dyer %T On J.H.C. Whitehead's aspherical question I. %J Commentarii mathematici Helvetici %D 1981 %P 431-446 %V 56 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1981__56_139878/ %F CMH_1981__56_139878