@article{GDZPPN001260847,
title = {The congruence class of an idempotent in a regular semigroup.},
journal = {Semigroup forum},
volume = {43},
year = {1991},
pages = {121-124},
zbl = {0741.20047},
url = {http://dml.mathdoc.fr/item/GDZPPN001260847}
}
Adams, M.E.; Gould, M.; Tschantz, S.T. The congruence class of an idempotent in a regular semigroup.. Semigroup forum, Tome 43 (1991) pp. 121-124. http://gdmltest.u-ga.fr/item/GDZPPN001260847/