Sanchez-Balderas, V. R., M. Fernández-Olvera, and R. D. J. Ascencio-Padilla. “Effect of Nasal Obstruction in the Acoustic Analysis of Voice”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 4, no. 2, Feb. 2018, pp. 321-5, doi:10.18203/issn.2454-5929.ijohns20180693.