@article{ELMA_1952__7_140575,
     author = {Alexander Aigner},
     title = {Eine kombinatorische {Systematik} der {Punktmengen.}},
     journal = {Elemente der Mathematik},
     pages = {11--14},
     publisher = {mathdoc},
     volume = {7},
     year = {1952},
     zbl = {0046.05302},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1952__7_140575/}
}