@article{SF_1974__6_133988,
     author = {J.W. Hogan},
     title = {Bisimple semigroups with idempotents well-ordered.},
     journal = {Semigroup forum},
     pages = {298--316},
     year = {1974},
     volume = {6},
     zbl = {0267.20056},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133988/}
}