1. Vowel height and the perception of consonantal nasality;Abramson;Journal of the Acoustical Society of America,1981
2. Perception of coarticulated nasality;Ali;Journal of the Acoustical Society of America,1971
3. Beddor, P. S. (1982). Phonological and Phonetic Effects of Nasalization on Vowel Height Unpublished doctoral dissertation, University of Minnesota, Minneapolis (Reproduced by Indiana University Linguistics Club, 1983).
4. The influence of spectral prominence on perceived vowel quality;Beddor;Journal of the Acoustical Society of America,1990
5. Cross-language study of perception of the oral-nasal distinction;Beddor;Journal of the Acoustical Society of America,1982