%0 Journal Article %A Herstein, I. N. %T Semi-Homomorphisms of Groups %J Canadian journal of mathematics %D 1968 %P 384-388 %V 20 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-034-7/ %R 10.4153/CJM-1968-034-7 %F 10_4153_CJM_1968_034_7