@article{MAN_1973__202_162398,
     author = {Donald Marxen},
     title = {Uniform {Semigroups.}},
     journal = {Mathematische Annalen},
     pages = {27--36},
     publisher = {mathdoc},
     volume = {202},
     year = {1973},
     zbl = {0234.22003},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__202_162398/}
}