@article{MZ_1966__92_170535,
     author = {Helmut Wegmann},
     title = {Ein {Dichtebegriff} f\"ur {Mengen} dyadisch rationaler {Zahlen.}},
     journal = {Mathematische Zeitschrift},
     pages = {51--64},
     publisher = {mathdoc},
     volume = {92},
     year = {1966},
     zbl = {0142.29402},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__92_170535/}
}