@article{MZ_1954__61_169477,
     author = {Helmut Salzmann},
     title = {\"Uber den {Zusammenhang} in topologischen projektiven {Ebenen.}},
     journal = {Mathematische Zeitschrift},
     pages = {489--494},
     publisher = {mathdoc},
     volume = {61},
     year = {1954},
     zbl = {0064.17802},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__61_169477/}
}