1. Touch display - a novel input/output device for computers;Johnson;Electronics Letters,1965
2. Touch screens now offer compelling uses;Shneiderman;IEEE Software,1991
3. Touch and the Apple iPhone;Walker;Veritas et Visus Touch Panel,2007
4. NPD DisplaySearch 2008-2013 Touch-Panel Market-Analysis Annual Reports
5. Buxton , B. 2007-2013 Multi-Touch Systems that I Have Known and Loved www.billbuxton.com/multitouchOverview.html