%0 Journal Article
%A Antonio Costa
%A Luigi Grasselli
%T Universal coverings of PL-mainfolds via coloured graphs.
%J Aequationes mathematicae
%D 1992
%P 60-71
%V 44
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1992__44_1_137480/
%F AM2_1992__44_1_137480