S. U. Ahmmed, A. Asaduzzaman, M. A. Ahsan, M. Z. Hossain, M. A. Azad, and M. I. Alam, “Hoarseness of Voice : An Etiological Study”, Bangladesh J of Otorhinolaryngology, vol. 23, no. 1, pp. 47–51, Jan. 2020.