@inproceedings{Hachenberger2008,
  author    = {Dirk Hachenberger},
  title     = {Completely free elements},
  booktitle = {Finite fields and applications: Proceedings of the third international conference, Glasgow, July 1995},
  editor    = {Stephen D. Cohen and Harald Niederreiter},
  pages     = {97 -- 107},
  year      = {2008},
}