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@article{SF_1972__4_133877, author = {J.T. Borrego and E.E. Devun}, title = {Maximal semigroup orbits.}, journal = {Semigroup forum}, pages = {61--68}, publisher = {mathdoc}, volume = {4}, year = {1972}, zbl = {0253.22001}, url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133877/} }
J.T. Borrego; E.E. Devun. Maximal semigroup orbits.. Semigroup forum, Tome 4 (1972), pp. 61-68. http://geodesic.mathdoc.fr/item/SF_1972__4_133877/