@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/