@article{MM2_1974__13_154253,
     author = {Walter Roelcke and Volker Eberhardt},
     title = {\"Uber einen {Graphensatz} f\"ur lineare {Abbildungen} mit metrisierbarem {Zielraum.}},
     journal = {Manuscripta mathematica},
     pages = {53--68},
     publisher = {mathdoc},
     volume = {13},
     year = {1974},
     zbl = {0281.46005},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__13_154253/}
}