Geng Yuan and  Yiwan Guo and  Fahui Zhai and  Shuhua Zhang,  Linear Maps That Preserve Left Spectrum of Diagonal Quaternionic Matrices.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2015, vol. 99(3). 206 - 209
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10003230.