SIGMUND, M. Influence of Psychological Stress on Formant Structure of Vowels. Elektronika ir Elektrotechnika, [S. l.], v. 18, n. 10, p. 45-48, 2012. DOI: 10.5755/j01.eee.18.10.3059. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/3059. Acesso em: 25 sep. 2022.