H. Bunt, M. Kipp, M. Maybury, and W. Wahlster. Multimodal Intelligent Information Presentation, volume 27 of Text, Speech and Language Technology, Springer, Dordrecht, (2005)
F. Ferri, P. Grifoni, and S. Paolozzi. Knowledge-Based Intelligent Information and Engineering Systems: KES 2007 -- WIRN 2007, 11th International Conference, KES 2007, XVII Italian Workshop on Neural Networks, Vietri sul Mare, Italy, volume 4693 of Lecture Notes in Artificial Intelligence, Springer, Berlin, (2007)