WASET
    Zhihua Yang and  Lihua Yang,  A New Definition of the Intrinsic Mode Function.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 1144 - 1147
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/14995.