Geodesic
Commutative semigroups that are nil of index 2 and have no irreducible elements
Mathematica Bohemica, Tome 133 (2008) no. 1, pp. 1-7.

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Every commutative nil-semigroup of index 2 can be imbedded into such a semigroup without irreducible elements.
DOI : 10.21136/MB.2008.133941
Classification : 20M14
Keywords: nil-semigroup; commutative nil-semigroup 
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Ježek, Jaroslav; Kepka, Tomáš; Němec, Petr. Commutative semigroups that are nil of index 2 and have no irreducible elements. Mathematica Bohemica, Tome 133 (2008) no. 1, pp. 1-7. doi : 10.21136/MB.2008.133941. http://geodesic.mathdoc.fr/articles/10.21136/MB.2008.133941/

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