@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/}
}