@article{SF_1983__27_134629,
     author = {D. LaTorre},
     title = {The least semilattice of groups congruence on a regular semigroup.},
     journal = {Semigroup forum},
     pages = {319--330},
     year = {1983},
     volume = {27},
     zbl = {0524.20039},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__27_134629/}
}