J. Chang, и M. Bourguet. Proceedings of the 22Nd British HCI Group Annual Conference on People and Computers: Culture, Creativity, Interaction - Volume 2, стр. 123--126. Swinton, UK, UK, British Computer Society, (2008)
A. Jameson, и K. Klöckner. Spoken Multimodal Human-Computer Dialogue in Mobile Environments, том 28 из Text, Speech and Language Technology, глава 19, Springer-Verlag, Berlin/Heidelberg, (2005)