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@article{SF_1985__32_134785, author = {V. Gould}, title = {The characterisation of monoids by properties of their {S-systems.}}, journal = {Semigroup forum}, pages = {251--266}, publisher = {mathdoc}, volume = {32}, year = {1985}, zbl = {0571.20067}, url = {http://geodesic.mathdoc.fr/item/SF_1985__32_134785/} }
V. Gould. The characterisation of monoids by properties of their S-systems.. Semigroup forum, Tome 32 (1985), pp. 251-266. http://geodesic.mathdoc.fr/item/SF_1985__32_134785/