@article{MAN_1967__172_161571,
     author = {R. HALIN},
     title = {Zur {Klssifikation} der endlichen {Graphen} nach {H.} {Hadwiger} und {K.} {Wagner}},
     journal = {Mathematische Annalen},
     pages = {46--78},
     publisher = {mathdoc},
     volume = {172},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__172_161571/}
}