%0 Journal Article
%A Johannes Huebschmann
%T Aspherical 2-Complexes and an Unsettled Problem of J. H. C. Whitehead.
%J Mathematische Annalen
%D 1981
%P 17-38
%V 258
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1981__258_163576/
%F MAN_1981__258_163576