@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/}
}