1. Using polynomial equations to model pitch contour shape in lexical tones;Andruski;Journal of the International Phonetic Association,2004
2. Phonation types in production of phonological tone: The case of Green Mong;Andruski;Journal of the International Phonetic Association,2000
3. Clinical measurement of speech and voice;Baken,1996
4. Boersma, P., & Weenink, D. (2005). Praat: Doing phonetics by computer (Version 4.3.01) [computer program]. Retrieved from: http://www.praat.org/.
5. Measures of phonation type in Hmong;Huffman;UCLA Working Papers in Phonetics,1985