JITWIRIYANONT, S. Formant frequency normalization for studying vowel variation in Thai. Journal of Language and Culture, Nakhon Pathom, Thailand, v. 38, n. 2, p. 46–65, 2019. Disponível em: https://so03.tci-thaijo.org/index.php/JLC/article/view/241642. Acesso em: 8 oct. 2026.