1. The World Federation of the Deaf,
http://www.hearinglossweb.com/res/hlorg/wfd.htm
2. Cornucopia of Disability Information: Disability Statistics,
http://codi.buffalo.edu/graph_based/demographics/.statistics.htm
3. Zetterholm, E.: Voice Imitation. A Phonetic Study of Perceptual Illusions and Acoustic Success, PhD thesis, Lund University (2003)
4. Zue, V., Cole, R., Ward, W.: Speech Recognition. Cambridge University Press, New York (1997)
5. Hung, J.W.: Optimization of Filter-Bank to Improve Extraction of MFCC Features in Speech Recognition. IEEE Transactions on Intelligent Multimedia, Video and Speech Processing, 675–678 (2004)