Tian Baoguang and  Liang Chunyan and  Chen Nan,  On the Positive Definite Solutions of Nonlinear Matrix Equation.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 87(3). 580 - 582
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9997855.