%0 Journal Article %A Petrich, Mario %T Congruences on Completely Regular Semigroups %J Canadian journal of mathematics %D 1989 %P 439-461 %V 41 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1989-020-6/ %R 10.4153/CJM-1989-020-6 %F 10_4153_CJM_1989_020_6