Tim Harter Sander Vroegindeweij Erik Geelhoed Meera Manahan Parthasarathy Ranganathan Energy-aware user interfaces: an evaluation of user acceptance. 199-206 2004 conf/chi/2004 CHI http://doi.acm.org/10.1145/985692.985718 db/conf/chi/chi2004.html#HarterVGMR04