@article{SF_1992__45_3_135171,
     author = {T.S. Blyth and E. Giraldes},
     title = {Perfect elements  in {Dubreil-Jacotin}   regular semigroups.},
     journal = {Semigroup forum},
     pages = {55--62},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1992},
     zbl = {0778.06012},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135171/}
}