@book{Witt2007,
  author    = {Kurt-Ulrich Witt},
  title     = {Algebraische Grundlagen der Informatik},
  series = {Studium},
  edition   = {3., {\"u}berarbeitete und erweiterte Auflage},
  publisher = {Vieweg},
  address   = {Wiesbaden},
  isbn      = {978-3-8348-0120-3},
  year      = {2007},
  language  = {de}
}