Jakob Leitner James Powell Peter Brandl Thomas Seifried Michael Haller Bernard Doray Paul To Flux: a tilting multi-touch and pen based surface. 3211-3216 2009 CHI Extended Abstracts http://doi.acm.org/10.1145/1520340.1520459 conf/chi/2009a db/conf/chi/chi2009a.html#LeitnerPBSHDT09