TY - JOUR AU - Burgess, W.D. TI - On Semi-Perfect Group Rings JO - Canadian mathematical bulletin PY - 1969 SP - 645 EP - 652 VL - 12 IS - 5 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-083-9/ DO - 10.4153/CMB-1969-083-9 ID - 10_4153_CMB_1969_083_9 ER -