@article{MAN_1957__133_160534,
     author = {H. Lenz},
     title = {Axiomatische {Bemerkung} zur {Polarentheorie.}},
     journal = {Mathematische Annalen},
     pages = {39--40},
     publisher = {mathdoc},
     volume = {133},
     year = {1957},
     zbl = {0077.13804},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__133_160534/}
}