@article{JRAM_1973__261_151330,
     author = {Wolfgang Ruppert},
     title = {Rechtstopologische {Halbgruppen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {123--133},
     year = {1973},
     volume = {261},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__261_151330/}
}