%0 Journal Article %A Manfred Armbrust %T Direct limits of congruence systems %J Colloquium Mathematicum %D 1973 %P 177-185 %V 27 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-27-2-177-185/ %R 10.4064/cm-27-2-177-185 %G en %F 10_4064_cm_27_2_177_185