WASET
    R. Rishma Rodrigo and  R. Radhika and  M. Vanitha Lakshmi ,  Speech Enhancement of Vowels Based on Pitch and Formant Frequency.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 99(3). 877 - 880
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10003778.