R. Neßelrath, и J. Alexandersson. Proceedings of the 6th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems, Pasadena, CA, USA, стр. 46-51. (2009)
M. Phillips, J. Nguyen, и A. Mischke. Advances in Speech Recognition: Mobile Environments, Call Centers and Clinics, глава 3, Springer, New York, (2010)