Mauricio Capra Milena Radenkovic Steve Benford Leif Oppermann Adam Drozd Martin Flintham The multimedia challenges raised by pervasive games. 89-95 2005 conf/mm/2005 ACM Multimedia http://doi.acm.org/10.1145/1101149.1101163 db/conf/mm/mm2005.html#CapraRBODF05