1. Gerard MJ, Armstrong TJ, Franzblau A, Martin BJ, Rempel DM. 1999. The effects of keyswitch stiffness on typing force, finger electromyography, and subjective discomfort. American Industrial Hygiene Association Journal, 60(6), 762–769. doi: 10.1080/00028899908984499 10635542
2. Korhan O, Mackieh A. 2010. A Model for Occupational Injury Risk Assessment of Musculoskeletal Discomfort and Their Frequencies in Computer Users. Safety Science, 48 (7), 868–877.
3. Capobianco G, Lee MD, Cohen S. 1999. Alphabetic Vs. QWERTY Keyboard Layouts for Touch Screens: Hasn't Someone Already Done That? Proceedings of the Human Factors and Ergonomics Society 43rd Annual Meeting.
4. Mackenzie S, Shawn X, Zhang R. 2003. William Soukoreff. Text entry using soft keyboards. Behavior & Information Technology, 1999, 18(4), 235–244.
5. Eggers J, Feillet D, Kehl S, Wagner MO, Yannou B. Optimization of the keyboard arrangement problem using an Ant Colony algorithm. 2003. European Journal of Operational Research, 148 (2003) 672–686.
6. Wagner MO, Yannou B, Kehl S, Feillet D, Eggers J. 2010. Ergonomic modelling and optimization of the keyboard arrangement with an ant colony algorithm. Eng. Design 14, 187–208
7. Liao C, Choe P. Chinese Keyboard Layout Design Based on Polyphone Disambiguation and a Genetic Algorithm. Intl. Journal of Human–Computer Interaction. 2013; 29, 391–403.
8. Bi X, Smith BA, Zhai S. Multilingual Touchscreen Keyboard Design and Optimization, Human-Computer Interaction. 2012; 27(4), 352–382.
9. Karrenbauer A, Oulasvirta A. 2014. Improvements to keyboard optimization with integer programming. Proceedings of the 27th annual ACM symposium on User interface software and technology, 621–626.
10. Iseri A, Eksioglu M. 2015. Estimation of digraph costs for keyboard layout optimization. International Journal of Industrial Ergonomics, 48, 127–138.
11. Yang N, Mali AD. 2016. Modifying keyboard layout to reduce finger-travel distance. IEEE 28th International Conference on Tools with Artificial Intelligence, 165–168.
12. Govind M, Panicker VV. 2016. Optimization of a single finger keyboard layout using genetic algorithm and TOPSIS. Int J Scientific Eng Res, 7, 102–5.