@article{CM_1964__16__186_0,
     author = {Volkmann, Bodo},
     title = {On non-normal numbers},
     journal = {Compositio Mathematica},
     pages = {186--190},
     publisher = {Kraus Reprint},
     volume = {16},
     year = {1964},
     mrnumber = {174548},
     zbl = {0142.29602},
     language = {en},
     url = {http://www.numdam.org/item/CM_1964__16__186_0/}
}