@article{JRAM_1954__193_150278,
     author = {Hans-Joachim Kanold},
     title = {\"Uber die {Dichte} von gewissen {Zahlenmengen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {250--252},
     publisher = {mathdoc},
     volume = {193},
     year = {1954},
     zbl = {0057.03905},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1954__193_150278/}
}