@article{MAN_1961__144_160892,
     author = {B. BOSBACH},
     title = {Arithmetische {Halbgruppen.}},
     journal = {Mathematische Annalen},
     pages = {239--252},
     publisher = {mathdoc},
     volume = {144},
     year = {1961},
     url = {http://geodesic.mathdoc.fr/item/MAN_1961__144_160892/}
}