Tracy Hammond Brian Eoff Brandon Paulson Aaron Wolin Katie Dahmen Joshua Johnston Pankaj Rajan Free-sketch recognition: putting the chi in sketching. 3027-3032 2008 CHI Extended Abstracts http://doi.acm.org/10.1145/1358628.1358802 conf/chi/2008a db/conf/chi/chi2008a.html#HammondEPWDJR08