@article{SF_1976__12_134165,
     author = {B. Bosbach},
     title = {Zur {Struktur} der inversen {Teilbarkeitshalbgruppen.}},
     journal = {Semigroup forum},
     pages = {137--144},
     year = {1976},
     volume = {12},
     zbl = {0366.06026},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134165/}
}