1. Using asymmetrical and gradient data in the study of vowel harmony;Anderson,1980
2. Problems and perspectives in the description of vowel harmony;Anderson,1980
3. Grounded phonology;Archangeli,1994
4. Transparency, strict locality, and targeted constraints;Baković,2000
5. Variability in the production of quantal vowels revisited;Beckman;Journal of the Acoustical Society of America,1995