THOMSON, R. I. L2 english vowel learning by mandarin speakers: Does perception precede production?. Canadian Acoustics, [S. l.], v. 36, n. 3, p. 134–135, 2008. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2074. Acesso em: 28 may. 2024.