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@article{SF_1974__8_134049, author = {Diana Lindsey}, title = {Relations {Invariant} under semigroup actions.}, journal = {Semigroup forum}, pages = {298--311}, publisher = {mathdoc}, volume = {8}, year = {1974}, zbl = {0292.20063}, url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134049/} }
Diana Lindsey. Relations Invariant under semigroup actions.. Semigroup forum, Tome 8 (1974), pp. 298-311. http://geodesic.mathdoc.fr/item/SF_1974__8_134049/