Kathy Ryall Clifton Forlines Chia Shen Meredith Ringel Morris Katherine Everitt Experiences with and Observations of Direct-Touch Tabletops. 89-96 2006 conf/tabletop/2006 Tabletop http://doi.ieeecomputersociety.org/10.1109/TABLETOP.2006.12 db/conf/tabletop/tabletop2006.html#RyallFSME06