1. Smoreda, Z., Thomas, F. “Use of SMS in Europe”, analysis of data from EURESCOM P903 study “Cross-cultural attitudes to ICT in everyday life” performed October to December 2000, http://www.eurescom.de/~ftproot/web-deliverables/public/P900-series/P903/sms_use/w1-sms.html , verified 17. April 2002
2. MacKenzie, S., Zhang, Shawn X., “An Empirical Investigation of the Novice Experience With Soft Keyboards” Behaviour & Information Technology, 20, 411–418
3. James, Christina L.; Reischel, Kelly M. “Text Input for Mobile Devices: Comparing Model Prediction to Actual Performance”, SIGCHI’01 March 31–April 4, 2001, pp. 365–371, Seattle, WA, USA
4. Silfverberg, Miika; MacKenzie, I. Scott; Korhonen, Panu “Predicting Text Entry Speed on Mobile Phones”, Proceedings of the ACM Conference on Human Factors in Computing Systems-CHI 2000, pp. 9–16, New York: ACM
5. MacKenzie, I. Scott; Zhang, S. “The Immediate Usability of Graffiti” Proceedings of Graphics Interface’ 97, pp. 129–137, Toronto: Canadian Information Processing Society