Davod Khojasteh Salkuyeh and  Sayyed Hasan Azizi,  Gauss-Seidel Iterative Methods for Rank Deficient Least Squares Problems.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2011, vol. 55(7). 1010 - 1014
    [viewed 19 January 2020]. Available from: https://publications.waset.org/pdf/14436.