@article{JRAM_1979__0311_0312_152187,
     author = {Daniel Segal and Fritz J. Grunewald},
     title = {On congruence topologies in number fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {389--396},
     publisher = {mathdoc},
     volume = {0311_0312},
     year = {1979},
     zbl = {0409.12005},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1979__0311_0312_152187/}
}