WASET
    Dong-Yan Huang and  Ee Ping Ong and  Susanto Rahardja and  Minghui Dong and  Haizhou Li,  Transformation of Vocal Characteristics: A Review of Literature.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 2288 - 2296
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/4782.