%0 Journal Article %A K.D. jr. Magill %T Semigroups for which the continuum congruences form finite chains. %J Semigroup forum %D 1984 %P 221-230 %V 30 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1984__30_134717/ %F SF_1984__30_134717