http://www.ling.gu.se/~anders/KatPer/Applet/index.eng.html

Ohala & Shriberg, 1990
Hypercorrection in speech perception.
Proc. ICSLP 90, 1, 405-408

Benki, J.R. (2003). 
Analysis of English Nonsense Syllable 
Recognition in Noise. Phonetica 60,129-157.

Mann & Repp paper

Lindblom & Studdert-Kennedy

Ohala chapter in Labphon I



Beddor, Goldstein, and Krakow (1986) 
simulated the change in vowel quality when 
nasalization is added

Perceptual constraints and phonological change:
a study of nasal vowel height, Phonology Yearbook, 3, 
197-217.