@book{Aarseth2009,
  author    = {Espen Aarseth},
  title     = {Locating the Game in Computer Games : from game structure to game semantics : Ringvorlesung 2009-12-03},
  url       = {http://info.ub.uni-potsdam.de/multimedia/show_projekt.php?projekt_id=79},
  year      = {2009},
}