@article{SF_1982__25_134588,
     author = {J.D. jr. Magill},
     title = {Semigroups in which ... and ... coincide for regular elements.},
     journal = {Semigroup forum},
     pages = {383--385},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0499.54032},
     url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134588/}
}