@article{SF_1979__17_134313,
     author = {K.E. Osondu},
     title = {Semilattices of left reversible semigroups.},
     journal = {Semigroup forum},
     pages = {139--152},
     year = {1979},
     volume = {17},
     zbl = {0402.20047},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134313/}
}