@article{SLC_1983_09_a5,
     author = {Peter Gerl},
     title = {Wachstum und {Irrfahrten} bei {Gruppen} und {Graphen}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {09},
     year = {1983},
     url = {http://geodesic.mathdoc.fr/item/SLC_1983_09_a5/}
}