@article{JRAM_1971__247_151096,
     author = {Horst Bergmann},
     title = {Eine {F\"arbungstheorie} f\"ur endliche {Graphen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {87--91},
     publisher = {mathdoc},
     volume = {247},
     year = {1971},
     zbl = {0223.05102},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1971__247_151096/}
}