S. Al Wadi and  Mohd Tahir Ismail and  Samsul Ariffin Abdul Karim,  Statistical Computational of Volatility in Financial Time Series Data.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2010, vol. 38(2). 287 - 291
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/165.