Hwan Kim, Yea-Kyung Row, Geehyuk Lee. Back keyboard: a physical keyboard on backside of mobile phone using qwerty. In Joseph A. Konstan, Ed H. Chi, Kristina Höök, editors, CHI Conference on Human Factors in Computing Systems, CHI '12, Extended Abstracts Volume, Austin, TX, USA, May 5-10, 2012. pages 1583-1588, ACM, 2012. [doi]