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@article{SF_1984__29_134690, author = {J. Clarke}, title = {Rees quotients of {N-semigroups.}}, journal = {Semigroup forum}, pages = {259--270}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0553.20039}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134690/} }
J. Clarke. Rees quotients of N-semigroups.. Semigroup forum, Tome 29 (1984), pp. 259-270. http://geodesic.mathdoc.fr/item/SF_1984__29_134690/