Aleksandra Zysk and  Pawel Badura,  An Approach for Vocal Register Recognition Based on Spectral Analysis of Singing.   journal   = {International Journal of Cognitive and Language Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 207 - 212
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10006407.