Geodesic
Semigroups all but one of whose proper subsemigroups are groups.
Semigroup forum, Tome 10 (1975), pp. 215-219.

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