@article{MAN_1968__175_161665,
     author = {W. MADER},
     title = {\"Uber trennende {Eckenmengen} in homomorphiekritischen {Graphen.}},
     journal = {Mathematische Annalen},
     pages = {243--252},
     publisher = {mathdoc},
     volume = {175},
     year = {1968},
     zbl = {0171.22406},
     url = {http://geodesic.mathdoc.fr/item/MAN_1968__175_161665/}
}