@article{SF_1981__23_134514,
     author = {A. Wannebo},
     title = {Representations of ordered semigroups by real numbers.},
     journal = {Semigroup forum},
     pages = {221--232},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     zbl = {0482.06009},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134514/}
}