@article{MOMA_1993__116_2_178630,
     author = {Mario Petrich},
     title = {Two {Congruence} {Lattices} of {Completely} {Simple} {Semigroups.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {287--298},
     publisher = {mathdoc},
     volume = {116},
     number = {2},
     year = {1993},
     zbl = {0811.20055},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1993__116_2_178630/}
}