@article{GDZPPN00125376X, title = {Lattices of order ideals on ordered semigroups.}, journal = {Semigroup forum}, volume = {20}, year = {1980}, pages = {151-176}, zbl = {0438.06010}, url = {http://dml.mathdoc.fr/item/GDZPPN00125376X} }
Shum, K.P.; Kwan, S.Y. Lattices of order ideals on ordered semigroups.. Semigroup forum, Tome 20 (1980) pp. 151-176. http://gdmltest.u-ga.fr/item/GDZPPN00125376X/