@article{CMJ_2001__51_2_a14,
     author = {Petrich, Mario},
     title = {Certain partial orders on semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {415--432},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2001},
     mrnumber = {1844320},
     zbl = {0983.20056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2001__51_2_a14/}
}