TY - JOUR AU - Burns, R. G. AU - Hale, V. W. D. TI - A Note on Group Rings of Certain Torsion-Free Groups JO - Canadian mathematical bulletin PY - 1972 SP - 441 EP - 445 VL - 15 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-080-3/ DO - 10.4153/CMB-1972-080-3 ID - 10_4153_CMB_1972_080_3 ER -