@article{SF_1988__37_1_134923,
     author = {Mario Petrich},
     title = {Congruences on strong semilattices of regular simple semigroups.},
     journal = {Semigroup forum},
     pages = {167--200},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {1988},
     zbl = {0643.20041},
     url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134923/}
}