@article{10_1017_S0017089500001087,
     author = {McAlister, D. B. and O'Carroll, L.},
     title = {Maximal homomorphic images of commutative semigroups},
     journal = {Glasgow mathematical journal},
     pages = {12--17},
     year = {1971},
     volume = {12},
     number = {1},
     doi = {10.1017/S0017089500001087},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001087/}
}