Thorsten Völkel Gerhard Weber Ulrich Baumann Tactile Graphics Revised: The Novel BrailleDis 9000 Pin-Matrix Device with Multitouch Input. 835-842 2008 ICCHP http://dx.doi.org/10.1007/978-3-540-70540-6_124 conf/icchp/2008 db/conf/icchp/icchp2008.html#VolkelWB08