%0 Journal Article %A A. Mitschke %T On a representation of groupoids as sums of directed systems %J Colloquium Mathematicum %D 1973 %P 11-18 %V 28 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-28-1-11-18/ %R 10.4064/cm-28-1-11-18 %G en %F 10_4064_cm_28_1_11_18