@article{GDZPPN00125121X, title = {Schwache Teilbarkeitshalbgruppen.}, journal = {Semigroup forum}, volume = {12}, year = {1976}, pages = {119-136}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN00125121X} }
Bosbach, B. Schwache Teilbarkeitshalbgruppen.. Semigroup forum, Tome 12 (1976) pp. 119-136. http://gdmltest.u-ga.fr/item/GDZPPN00125121X/