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@article{SF_1971__3_133872, author = {U. Knauer}, title = {Projectivity of acts and {Morita} equivalence of monoids.}, journal = {Semigroup forum}, pages = {359--370}, publisher = {mathdoc}, volume = {3}, year = {1971}, zbl = {0231.18013}, url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133872/} }
U. Knauer. Projectivity of acts and Morita equivalence of monoids.. Semigroup forum, Tome 3 (1971), pp. 359-370. http://geodesic.mathdoc.fr/item/SF_1971__3_133872/