G. V.M. Hari Prasad, B. Rajashekhar and N.P. Natraja. 1. “Acoustic Analysis of Vowels in Alaryngeal Speech”. Journal of All India Institute of Speech and Hearing 24 & 25 (1), 13-15. http://203.129.241.91/jaiish/index.php/aiish/article/view/970.