@article{SF_1972__5_133935,
     author = {J.C. Propes},
     title = {Maximal ideal complements which are subsemigroups.},
     journal = {Semigroup forum},
     pages = {174--175},
     publisher = {mathdoc},
     volume = {5},
     year = {1972},
     zbl = {0263.20035},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133935/}
}