Pereyron, Leticia, and Ubiratã Kickhöfel Alves. “Effects of Articulatory Instruction Concerning the Low Mid Vowels of Portuguese (L3) on Spanish (L1) and English (L2): A Case Study”. BELT - Brazilian English Language Teaching Journal 9, no. 1 (September 19, 2018): 167–189. Accessed April 25, 2024. https://revistaseletronicas.pucrs.br/index.php/belt/article/view/31990.