@article{MAN_1973__200_162361,
     author = {Dietmar Kahnert},
     title = {Graphen reeller {Funktionen.}},
     journal = {Mathematische Annalen},
     pages = {287--292},
     publisher = {mathdoc},
     volume = {200},
     year = {1973},
     zbl = {0234.28012},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__200_162361/}
}