BALBONAS, D.; DAUNYS, G. Movement of Formants of Vowels in Lithuanian Language. Elektronika ir Elektrotechnika, [S. l.], v. 79, n. 7, p. 15-18, 2007. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/10830. Acesso em: 7 apr. 2025.