Giovanni Casella Vincenzo Deufemia Viviana Mascardi Gennaro Costagliola Maurizio Martelli An agent-based framework for sketched symbol interpretation. 225-257 2008 19 J. Vis. Lang. Comput. 2 http://dx.doi.org/10.1016/j.jvlc.2007.04.002 db/journals/vlc/vlc19.html#CasellaDMCM08