@article{LJM_2005_19_a2,
     author = {X.-Yu. Xie and F. Yan},
     title = {Fuzzy ideals extenstions of ordered semigroups},
     journal = {Lobachevskii journal of mathematics},
     pages = {29--40},
     publisher = {mathdoc},
     volume = {19},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2005_19_a2/}
}