@article{SF_1976__12_134157,
     author = {B. Madison and D. Lindsey},
     title = {The lattice of congruences on a {Baer-Levi} semigroup.},
     journal = {Semigroup forum},
     pages = {63--70},
     publisher = {mathdoc},
     volume = {12},
     year = {1976},
     zbl = {0321.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134157/}
}