@article{SF_1972__5_133941,
     author = {G.R. Baird},
     title = {On a sublattice- of the lattice of congruences on a  0-regular semigroup.},
     journal = {Semigroup forum},
     pages = {228--235},
     publisher = {mathdoc},
     volume = {5},
     year = {1972},
     zbl = {0265.20059},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133941/}
}