Ina Wagner Wolfgang Broll Giulio Jacucci Kari Kuutti Rod McCall Ann Morrison Dieter Schmalstieg Jean-Jacques Terrin On the Role of Presence in Mixed Reality. 249-276 2009 18 Presence 4 http://dx.doi.org/10.1162/pres.18.4.249 db/journals/presence/presence18.html#WagnerBJKMMST09