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K. Kamei, K. Shinozawa, T. Ikeda, A. Utsumi, T. Miyashita, and N. Hagita. Proceedings of the 12th International Conference on Multimodal Interfaces and the 7th Workshop on Machine Learning for Multimodal Interfaces (IMCI-MLMI 2010), Beijing, China, page 19:1--19:8. (2010)
H. Kagermann, W. Wahlster, and J. Helbig. Final Report of the Industrie 4.0 Working Group, acatech -- National Academy of Science and Engineering, München, (April 2013)
T. Strohman, W. Croft, and D. Jensen. Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval, page 705--706. New York, NY, USA, ACM, (2007)