T. Kurata, M. Kourogi, T. Okuma, T. Ishikawa, R. Ueoka, R. Tenmoku, and K. Makita. Proceedings of CSCW 2012 Workshop: Exploring collaboration in challenging environments: From the car to the factory and beyond, (2012)(available at http://workshops.icts.sbg.ac.at/cscw2012/).
Y. Sumi, M. Yano, and T. Nishida. International Conference on Multimodal Interfaces and the Workshop on Machine Learning for Multimodal Interaction, page 44:1--44:4. New York, NY, USA, ACM, (2010)
K. Yano, K. Ara, N. Moriwaki, and H. Kuriyama. Hitachi review, 58 (4):
139-144(2009)(available at http://www.hitachi.com/rev/archive/2009/2115394_44634.html, last-accessed: 2013-05-17).