Montola, M. (2005) Exploring the Edge of the Magic Circle. Defining Pervasive Games. DAC 2005 conference, December 1.-3. IT University of Copenhagen. Available at: http://users.tkk.fi/~mmontola/exploringtheedge.pdf [Accessed February 03, 2009].
as a further reading...
Nieuwdorp, E. (2005). The Pervasive Interface; Tracing the Magic Circle. DiGRA 2005, June 16-20. Vancouver Available at: http://www.digra.org/dl/ [Accessed February 01, 2009].
(sorry i posted this as the reading by mistake)
