Stephen Chen George Frempong William C. Cudmore Gesture Friendly Interfaces for Classroom Teaching with Thinking Tools. 279-283 2006 conf/ifip3/2006 Education for the 21st Century http://dx.doi.org/10.1007/978-0-387-34731-8_31 db/conf/ifip3/ifip3-2006.html#ChenFC06