1. Pavlovych, A., Stuerzlinger, W.: Less-Tap: A fast and easy-to-learn text input technique for phones. In: Graphics Interface, pp. 97–104 (2003)
2. MacKenzie, I.S.: KSPC (Keystrokes per Character) as a Characteristic of Text Entry Techniques. In: Proceedings of the 4th International Symposium on Mobile Human-Computer Interaction, Mobile HCI 2002, pp. 195–210. Springer, London (2002)
3. MacKenzie, I.S., Kober, H., Smith, D., Jones, T., Skepner, E.: LetterWise: prefix-based disambiguation for mobile text input. In: Proceedings of the 14th Annual ACM Symposium on User Interface Software and Technology, UIST 2001, pp. 111–120. ACM, New York (2001)
4. Grover, D.L., King, M.T., Kushler, C.A.: Reduced keyboard disambiguating computer (1998)
5. Gutowitz, H.: Barriers to adoption of dictionary-based text-entry methods: a field study. In: Proc. 2003 EACL Workshop on Language Modeling for Text Entry Methods, TextEntry 2003, pp. 33–41. ACL, Stroudsburg (2003)