@article{SF_1972__4_133889,
     author = {M. Mislove and J.F. Berglund},
     title = {A class of semigroups having almost trivial multiplications.},
     journal = {Semigroup forum},
     pages = {169--172},
     year = {1972},
     volume = {4},
     zbl = {0254.22001},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133889/}
}