@article{MET_1971__17_175470,
     author = {C. Marfels},
     title = {Einige neuere {Entwicklungen} in der {Messung} der industriellen {Konzentration} .},
     journal = {Metrika},
     pages = {69--81},
     year = {1971},
     volume = {17},
     url = {http://geodesic.mathdoc.fr/item/MET_1971__17_175470/}
}