@article{MAN_1963__151_161088,
     author = {N.J. ROTHMAN},
     title = {On the {Uniqueness} of {Character} {Semigroups.}},
     journal = {Mathematische Annalen},
     pages = {346--354},
     year = {1963},
     volume = {151},
     zbl = {0114.25302},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__151_161088/}
}