@article{GDZPPN002039583, title = {Universal coverings of PL-mainfolds via coloured graphs.}, journal = {Aequationes mathematicae}, volume = {44}, year = {1992}, pages = {60-71}, zbl = {0764.57004}, url = {http://dml.mathdoc.fr/item/GDZPPN002039583} }
Costa, Antonio; Grasselli, Luigi. Universal coverings of PL-mainfolds via coloured graphs.. Aequationes mathematicae, Tome 44 (1992) pp. 60-71. http://gdmltest.u-ga.fr/item/GDZPPN002039583/