B. Denkena, M. Dittrich, и F. Winter. Cyber-Physical and Gentelligent Systems in Manufacturing and Life Cycle, глава 3.1.1, Academic Press, London, (2017)
X. Huang, и S. Oviatt. Machine Learning for Multimodal Interaction: Second International Workshop, MLMI 2005, Edinburgh, UK, July 11--13, 2005, Revised Selected Papers, том 3869 из Lecture Notes in Computer Science, Springer, Berlin, (2006)