Martin Braun Oliver Stefani Achim Pross Matthias Bues Dieter Spath Human Factors in Lighting. 223-230 2009 HCI (15) http://dx.doi.org/10.1007/978-3-642-02731-4_26 conf/hci/2009-15 db/conf/hci/hci2009-15.html#BraunSPBS09