@article{SF_1996__53_2_135470,
     author = {Xiang-Yun Xie and Ming-Fen Wu},
     title = {On the ideal extensions in ordered semigroups.},
     journal = {Semigroup forum},
     pages = {63--71},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0848.06012},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135470/}
}