@article{10_4064_cm_27_2_177_185,
     author = {Manfred Armbrust},
     title = {Direct limits of congruence systems},
     journal = {Colloquium Mathematicum},
     pages = {177--185},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1973},
     doi = {10.4064/cm-27-2-177-185},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-27-2-177-185/}
}