Nureni O. Adeboye and  Dawud A. Agunbiade,  Monte Carlo Estimation of Heteroscedasticity and Periodicity Effects in a Panel Data Regression Model .   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2019, vol. 150(6). 157 - 166
    [viewed 06 December 2019]. Available from: https://publications.waset.org/pdf/10010519.