Yongxin Yuan and  Hao Liu,  The Inverse Problem of Nonsymmetric Matrices with a Submatrix Constraint and its Approximation.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 861 - 865
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/3805.