M. Pantic, A. Pentland, A. Nijholt, and T. Huang. Artifical Intelligence for Human Computing, volume 4451 of Lecture Notes in Artificial Intelligence, Springer, Berlin, (2007)
N. Pfleger, J. Alexandersson, and T. Becker. Proceedings of IJCAI-03 Third Workshop on Knowledge and Reasoning in Practical Dialogue System, Acapulco, Mexico, (2003)
M. Phillips, J. Nguyen, and A. Mischke. Advances in Speech Recognition: Mobile Environments, Call Centers and Clinics, chapter 3, Springer, New York, (2010)
D. Porta. Informatik 2010: Service Science -- Neue Perspektiven für die Informatik, Beiträge der 40. Jahrestagung der Gesellschaft für Informatik e.V. (GI), Band 1, volume P-175 of GI Edition: Lecture Notes in Informatics (LNI) -- Proceedings, page 497--502. Bonn, Gesellschaft für Informatik, (2010)