%0 Journal Article %A Banaschewski, Bernhard %T On Proving the Absence of Zero-Divisors for Semi-Group Rings %J Canadian mathematical bulletin %D 1961 %P 225-231 %V 4 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-024-4/ %R 10.4153/CMB-1961-024-4 %F 10_4153_CMB_1961_024_4