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M. Phillips, J. Nguyen, and A. Mischke. Advances in Speech Recognition: Mobile Environments, Call Centers and Clinics, chapter 3, Springer, New York, (2010)
M. Böhmer, B. Hecht, J. Schöning, A. Krüger, and G. Bauer. Proceedings of MobileHCI '11: 13th International Conference on Human Computer Interaction with Mobile Devices and Services, Stockholm, Sweden, page 47-56. (2011)