Elchaira N, Syarfina T. An Analysis of Formant Frequency of Indonesia Vowels By Bataknese and Javanese Speakers. LEEA [Internet]. 2024 Dec. 31 [cited 2025 Apr. 4];8(1):143-54. Available from: https://journal.ipm2kpe.or.id/index.php/LEEA/article/view/10347