@article{GDZPPN001250299, title = {Fastideale von Halbgruppen.}, journal = {Semigroup forum}, volume = {7}, year = {1974}, pages = {261-270}, url = {http://dml.mathdoc.fr/item/GDZPPN001250299} }
Jürgensen, H. Fastideale von Halbgruppen.. Semigroup forum, Tome 7 (1974) pp. 261-270. http://gdmltest.u-ga.fr/item/GDZPPN001250299/