Geodesic
Commutative zeropotent semigroups with few invariant congruences
Czechoslovak Mathematical Journal, Tome 58 (2008) no. 4, pp. 865-885.

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Commutative semigroups satisfying the equation $2x+y=2x$ and having only two $G$-invariant congruences for an automorphism group $G$ are considered. Some classes of these semigroups are characterized and some other examples are constructed.
Classification : 08A30, 20M14, 20M30
Keywords: commutative; zeropotent; semigroup 
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     author = {Bashir, Robert El and Kepka, Tom\'a\v{s}},
     title = {Commutative zeropotent semigroups with few invariant congruences},
     journal = {Czechoslovak Mathematical Journal},
     pages = {865--885},
     publisher = {mathdoc},
     volume = {58},
     number = {4},
     year = {2008},
     mrnumber = {2471153},
     zbl = {1165.20322},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008__58_4_a0/}
}
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Bashir, Robert El; Kepka, Tomáš. Commutative zeropotent semigroups with few invariant congruences. Czechoslovak Mathematical Journal, Tome 58 (2008) no. 4, pp. 865-885. http://geodesic.mathdoc.fr/item/CMJ_2008__58_4_a0/