@article{MZ_1920__8_167596,
     author = {C., Heumann},
     title = {Ein {Satz} \"uber {Culmannsche} {Tr\"agheitsellipsen}},
     journal = {Mathematische Zeitschrift},
     pages = {155--158},
     publisher = {mathdoc},
     volume = {8},
     year = {1920},
     zbl = {47.0544.05},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__8_167596/}
}