@article{SF_1971__3_133840,
     author = {B. Bosbach},
     title = {Zur {Theorie} der {Teilbarkeitshalbgruppen.}},
     journal = {Semigroup forum},
     pages = {1--30},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0226.20069},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133840/}
}