References

Lobanov, B. M. (1971). Classification of Russian Vowels Spoken by Different Speakers, J. Acoust. Soc. Am.49(3), pp. 606-608. [PDF]

Nearey, T. M. (1977). Applications of generalized linear modeling to vowel data, Proceedings ICLSP 92, pp. 583-586. [PDF]

Shirai, S. (2004). Lexical effects in Japanese vowel reduction, Unpublished PhD. thesis, University of Washington.

Wassink, A. B. (2006) A geometric representation of spectral and temporal vowel features: Quantification of vowel overlap in three varieties,Journal of the Acoustical Society of America, 119(4), pp 2334-2350.[PDF]

Wassink, A. B. (1999) A sociophonetic analysis of Jamaican vowels. Unpublished PhD dissertation, University of Michigan, Ann Arbor.