@article{05141789, title = {Fuzzy ideals extensions of ordered semigroups.}, journal = {Lobachevskii Journal of Mathematics}, volume = {17}, year = {2005}, pages = {29-40}, zbl = {1119.06011}, language = {en}, url = {http://dml.mathdoc.fr/item/05141789} }
Xie, Xiang-Yun; Yan, Feng. Fuzzy ideals extensions of ordered semigroups.. Lobachevskii Journal of Mathematics, Tome 17 (2005) pp. 29-40. http://gdmltest.u-ga.fr/item/05141789/