TY - JOUR AU - Alexander Schmidt TI - Rings of integers of type $K(\pi,1)$ JO - Documenta mathematica PY - 2007 SP - 441 EP - 471 VL - 12 UR - http://geodesic.mathdoc.fr/articles/10.4171/dm/230/ DO - 10.4171/dm/230 ID - 10_4171_dm_230 ER -