@article{SF_1994__49_2_135341,
     author = {K.G. Johnson},
     title = {Decomposition of regular subsemigroup lattices.},
     journal = {Semigroup forum},
     pages = {131--136},
     year = {1994},
     volume = {49},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135341/}
}