Virtual Touchscreen - a novel User Interface made of Light - Principles, metaphors and experiences. - Christoph Maggioni; Hans Röttger (HCI (1), 1999)

SmartKom-Public. - Axel Horndasch; Horst Rapp; Hans Röttger (SmartKom, 2006)

The Sense of Vision: Gestures and Real Objects. - Jens Racky; Michael Lützeler; Hans Röttger (SmartKom, 2006)