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@article{SF_1990__41_2_135043, author = {K. Byleen}, title = {Embedding any countable semigroups in a 2-generated congruence-free semigroup.}, journal = {Semigroup forum}, pages = {145--154}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1990}, zbl = {0702.20045}, url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135043/} }
K. Byleen. Embedding any countable semigroups in a 2-generated congruence-free semigroup.. Semigroup forum, Tome 41 (1990) no. 2, pp. 145-154. http://geodesic.mathdoc.fr/item/SF_1990__41_2_135043/