%0 Journal Article %A Petrich, Mario %T The congruence lattice of an ideal extension of semigroups %J Glasgow mathematical journal %D 1993 %P 39-50 %V 35 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S001708950000954X/ %R 10.1017/S001708950000954X %F 10_1017_S001708950000954X