@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/