WASET
    C. Slim,  Nonstationarity Modeling of Economic and Financial Time Series.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2017, vol. 132(12). 2773 - 2779
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/10008340.