Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1995__50_3_135395, author = {N. Kehayopulu and M. Tsingelis}, title = {Pseudoorder in ordered semigroups.}, journal = {Semigroup forum}, pages = {389--392}, publisher = {mathdoc}, volume = {50}, number = {3}, year = {1995}, zbl = {0828.06010}, url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135395/} }
N. Kehayopulu; M. Tsingelis. Pseudoorder in ordered semigroups.. Semigroup forum, Tome 50 (1995) no. 3, pp. 389-392. http://geodesic.mathdoc.fr/item/SF_1995__50_3_135395/