%0 Journal Article %A K.P. Shum %A S.Y. Kwan %T Lattices of order ideals on ordered semigroups. %J Semigroup forum %D 1980 %P 151-176 %V 19 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1980__19_134380/ %F SF_1980__19_134380