@article{JRAM_1909__135_149298,
     author = {Gerhard Hessenberg},
     title = {Kettentheorie und {Wahlordnung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {81--133},
     publisher = {mathdoc},
     volume = {135},
     year = {1909},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1909__135_149298/}
}