Baoguang Tian and  Nan Chen,  The Relative Efficiency of Parameter Estimation in Linear Weighted Regression.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2014, vol. 95(11). 1399 - 1402
    [viewed 28 November 2021]. Available from: https://publications.waset.org/pdf/9999966.