Chia-Hsun Jackie Lee Chiun-Yi Ian Jang Ting-Han Daniel Chen Jon Wetzel Yang-Ting Bowbow Shen Ted Selker Attention meter: a vision-based input toolkit for interaction designers. 1007-1012 2006 conf/chi/2006a CHI Extended Abstracts http://doi.acm.org/10.1145/1125451.1125644 db/conf/chi/chi2006a.html#LeeJCWSS06