@article{SF_1980__19_134371,
     author = {C.S. Hoo and K.P. Shum},
     title = {Prime radical theorem on ordered semigroups.},
     journal = {Semigroup forum},
     pages = {87--94},
     publisher = {mathdoc},
     volume = {19},
     year = {1980},
     zbl = {0436.06015},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134371/}
}