@TechReport{BallagasBorchers06,
  author =	 "Rafael Ballagas and Jan Borchers",
  title =	 "Selexels: a Conceptual Framework for Pointing Devices with Low Expressiveness",
  institution =	 "RWTH Aachen",
  year =	 "2006",
  number =	 "AIB-2006-16",
  month =	 dec,
  url =          "http://aib.informatik.rwth-aachen.de/2006/2006-16.ps.gz",
}