Caleb T. Phillips Suresh Singh Douglas C. Sicker Dirk Grunwald Applying models of user activity for dynamic power management in wireless devices. 315-318 2008 Mobile HCI http://doi.acm.org/10.1145/1409240.1409277 conf/mhci/2008 db/conf/mhci/mhci2008.html#PhillipsSSG08