@article{SF_1982__24_134531,
     author = {A.B. Cripps},
     title = {A comparison of some generalizations of {Green's} relations.},
     journal = {Semigroup forum},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {24},
     year = {1982},
     zbl = {0506.20034},
     url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134531/}
}