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@article{AM2_1971__7_136218, author = {JOHN BAILLIEUL}, title = {Green's {Relations} in {Finnite} {Function} {Semigroups}}, journal = {Aequationes mathematicae}, pages = {22--27}, publisher = {mathdoc}, volume = {7}, year = {1971}, zbl = {0239.20080}, url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136218/} }
JOHN BAILLIEUL. Green's Relations in Finnite Function Semigroups. Aequationes mathematicae, Tome 7 (1971), pp. 22-27. http://geodesic.mathdoc.fr/item/AM2_1971__7_136218/