RAI, T. M. Koyee Vowels: An Acoustic Analysis. Gipan, [S. l.], v. 3, n. 2, p. 136–143, 2017. DOI: 10.3126/gipan.v3i2.48918. Disponível em: https://nepjol.info/index.php/gipan/article/view/48918. Acesso em: 1 sep. 2024.