Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1979__15_4_a3, author = {J\"urgensen, H.}, title = {Disjunktive {Teilmengen} inverser {Halbgruppen}}, journal = {Archivum mathematicum}, pages = {205--207}, publisher = {mathdoc}, volume = {15}, number = {4}, year = {1979}, mrnumber = {563148}, zbl = {0439.20044}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/ARM_1979__15_4_a3/} }
Jürgensen, H. Disjunktive Teilmengen inverser Halbgruppen. Archivum mathematicum, Tome 15 (1979) no. 4, pp. 205-207. http://geodesic.mathdoc.fr/item/ARM_1979__15_4_a3/