Toshitaka Amaoka Hamid Laga Suguru Saito Masayuki Nakajima Personal Space Modeling for Human-Computer Interaction. 60-72 2009 ICEC http://dx.doi.org/10.1007/978-3-642-04052-8_6 conf/iwec/2009 db/conf/iwec/icec2009.html#AmaokaLSN09