- MUM, page 9. ACM, (2010)
- ICCE, page 997-1001. (2002)
- EuroPLoP, page 645-660. UVK - Universitaetsverlag Konstanz, (2004)
- User Interfaces for All, volume 2615 of Lecture Notes in Computer Science, page 179-186. Springer, (2002)
- IEEE Transactions on Audio, Speech and Language Processing 14(1):342--355 (January 2006)
- Informatics in Education 6(1):189-196 (2007)
- IEEE Transactions on Audio, Speech & Language Processing 18(1):50-57 (2010)
- Tampere University of Technology, Tampere, Finland, (June 2009)
- IEEE Trans. Speech and Audio Processing 14(1):342--355 (2006)
- Educational Technology & Society 9(3):195-205 (2006)
- RFC 4072 Proposed Standard, (August 2005)
- RFC 4137 Informational, (August 2005)
- RFC 4279 Proposed Standard, (December 2005)
- RFC 4282 Proposed Standard, (December 2005)
- RFC 4284 Informational, (January 2006)
- RFC 4507 Proposed Standard, (May 2006)Obsoleted by RFC 5077 .
- RFC 4555 Proposed Standard, (June 2006)
- RFC 4718 Informational, (October 2006)
- RFC 4739 Experimental, (November 2006)
- RFC 5077 Proposed Standard, (January 2008)


author