@article{SF_1975__10_134113,
     author = {J.R. Gard},
     title = {Semigroups all but one of whose proper subsemigroups are groups.},
     journal = {Semigroup forum},
     pages = {215--219},
     year = {1975},
     volume = {10},
     zbl = {0299.20041},
     url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134113/}
}