Impurities Of Letters And Their Effect On Voiceless And Voiced Sounds: An Analytical Study. International Journal of Environmental Sciences, [S. l.], p. 236–253, 2025. DOI: 10.64252/jy2zy214. Disponível em: https://theaspd.com/index.php/ijes/article/view/5692.. Acesso em: 25 apr. 2026.