@article{GDZPPN001262297, title = {Commutative semigroups which are embeddable into epigroups.}, journal = {Semigroup forum}, volume = {46}, year = {1993}, pages = {78-84}, zbl = {0805.20056}, url = {http://dml.mathdoc.fr/item/GDZPPN001262297} }
Tretjakova, E.G. Commutative semigroups which are embeddable into epigroups.. Semigroup forum, Tome 46 (1993) pp. 78-84. http://gdmltest.u-ga.fr/item/GDZPPN001262297/