%0 Journal Article %A Pirnot, Thomas L. %T Certain congruences on a completely regular semigroup %J Glasgow mathematical journal %D 1974 %P 109-120 %V 15 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002275/ %R 10.1017/S0017089500002275 %F 10_1017_S0017089500002275