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@article{SF_1993__46_1_135212, author = {S. Schanuel and J. Isbell}, title = {Some closure properties in monoids.}, journal = {Semigroup forum}, pages = {73--77}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0776.20022}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135212/} }
S. Schanuel; J. Isbell. Some closure properties in monoids.. Semigroup forum, Tome 46 (1993) no. 1, pp. 73-77. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135212/