@article{10_1017_S0017089508004230,
     author = {FERNANDES, V\'ITOR H.},
     title = {NORMALLY {ORDERED} {SEMIGROUPS}},
     journal = {Glasgow mathematical journal},
     pages = {325--333},
     year = {2008},
     volume = {50},
     number = {2},
     doi = {10.1017/S0017089508004230},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089508004230/}
}