@article{GDZPPN001256319,
title = {The least semilattice of groups congruence on a regular semigroup.},
journal = {Semigroup forum},
volume = {26},
year = {1983},
pages = {319-330},
zbl = {0524.20039},
url = {http://dml.mathdoc.fr/item/GDZPPN001256319}
}
LaTorre, D. The least semilattice of groups congruence on a regular semigroup.. Semigroup forum, Tome 26 (1983) pp. 319-330. http://gdmltest.u-ga.fr/item/GDZPPN001256319/