%0 Journal Article %A Alberto Cavicchioli %T Neuwirth manifolds and colourings of graphs. %J Aequationes mathematicae %D 1992 %P 168-187 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1992__44_1_137490/ %F AM2_1992__44_1_137490