Eiji Tokunaga Hiroaki Kimura Nobuyuki Kobayashi Tatsuo Nakajima Virtual tangible widgets: seamless universal interaction with personal sensing devices. 325-332 2005 conf/icmi/2005 ICMI http://doi.acm.org/10.1145/1088463.1088518 db/conf/icmi/icmi2005.html#TokunagaKKN05