WASET
    B. S. Saini and  Dilbag Singh and  Moin Uddin and  Vinod Kumar,  Improved Power Spectrum Estimation for RR-Interval Time Series.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 2108 - 2112
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/6930.