@article{02039383, title = {A note on semi-pseudoorders in semigroups.}, journal = {Lobachevskii Journal of Mathematics}, volume = {12}, year = {2003}, pages = {51-55}, zbl = {1041.06006}, language = {en}, url = {http://dml.mathdoc.fr/item/02039383} }
Kehayopulu, Niovi; Tsingelis, Michael. A note on semi-pseudoorders in semigroups.. Lobachevskii Journal of Mathematics, Tome 12 (2003) pp. 51-55. http://gdmltest.u-ga.fr/item/02039383/