@article{10_4153_CJM_1968_034_7,
     author = {Herstein, I. N.},
     title = {Semi-Homomorphisms of {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {384--388},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-034-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-034-7/}
}