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@article{SF_1984__28_134661, author = {T. Nordahl}, title = {Finitely generated left commutative semigroups are residually finite.}, journal = {Semigroup forum}, pages = {347--354}, publisher = {mathdoc}, volume = {28}, year = {1984}, zbl = {0525.20046}, url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134661/} }
T. Nordahl. Finitely generated left commutative semigroups are residually finite.. Semigroup forum, Tome 28 (1984), pp. 347-354. http://geodesic.mathdoc.fr/item/SF_1984__28_134661/