Perkell, Joseph S., Kenneth Stevens, and Stefanie Shattuck-Hufnagel. 6.542J Laboratory on the Physiology, Acoustics, and Perception of Speech,Fall 2005. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 23 May, 2013). License: Creative Commons BY-NC-SA

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