@article{GDZPPN001264184, title = {Pseudoorder in ordered semigroups.}, journal = {Semigroup forum}, volume = {51}, year = {1995}, pages = {389-392}, zbl = {0828.06010}, url = {http://dml.mathdoc.fr/item/GDZPPN001264184} }
Kehayopulu, N.; Tsingelis, M. Pseudoorder in ordered semigroups.. Semigroup forum, Tome 51 (1995) pp. 389-392. http://gdmltest.u-ga.fr/item/GDZPPN001264184/