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@article{MAN_1981__258_163576, author = {Johannes Huebschmann}, title = {Aspherical {2-Complexes} and an {Unsettled} {Problem} of {J.} {H.} {C.} {Whitehead.}}, journal = {Mathematische Annalen}, pages = {17--38}, publisher = {mathdoc}, volume = {258}, year = {1981}, zbl = {0458.57001}, url = {http://geodesic.mathdoc.fr/item/MAN_1981__258_163576/} }
Johannes Huebschmann. Aspherical 2-Complexes and an Unsettled Problem of J. H. C. Whitehead.. Mathematische Annalen, Tome 258 (1981), pp. 17-38. http://geodesic.mathdoc.fr/item/MAN_1981__258_163576/