TY - JOUR AU - Riley, David M. TI - Group Rings With Hypercentral Unit Groups JO - Canadian journal of mathematics PY - 1991 SP - 425 EP - 434 VL - 43 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-025-3/ DO - 10.4153/CJM-1991-025-3 ID - 10_4153_CJM_1991_025_3 ER -