S. Oviatt. The Human-Computer Interaction Handbook: Fundamentals, Evolving Technologies and Emerging Applications, chapter Multimodal interfaces, L. Erlbaum Associates Inc., Hillsdale, NJ, USA, (2003)
S. Oviatt, R. Coulston, and R. Lunsford. Proceedings of the 6th international conference on Multimodal interfaces, page 129--136. New York, NY, USA, ACM, (2004)
S. Kavaldjian. ESEC-FSE '07: Proceedings of the the 6th joint meeting of the European software engineering conference and the ACM SIGSOFT symposium on The foundations of software engineering, page 603--606. New York, NY, USA, ACM, (2007)