@article{10_4153_CJM_1970_070_4,
     author = {Plemmons, R. J.},
     title = {On a {Conjecture} {Concerning} {Semigroup} {Homomorphisms}},
     journal = {Canadian journal of mathematics},
     pages = {641--644},
     year = {1970},
     volume = {22},
     number = {3},
     doi = {10.4153/CJM-1970-070-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-070-4/}
}