@article{MZ_1973__131_171892,
     author = {W. Mader},
     title = {Ein {Extremalproblem} des {Zusammenhangs} von {Graphen.}},
     journal = {Mathematische Zeitschrift},
     pages = {223--232},
     publisher = {mathdoc},
     volume = {131},
     year = {1973},
     zbl = {0244.05116},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__131_171892/}
}