@article{JRAM_1991__420_153355,
     author = {B.H. Matzat},
     title = {Z\"opfe und {Galoissche} {Gruppen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {99--160},
     year = {1991},
     volume = {420},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1991__420_153355/}
}