R. B. Ogunrinde and  C. C. Jibunoh,  A Spectral Decomposition Method for Ordinary Differential Equation Systems with Constant or Linear Right Hand Sides.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2016, vol. 118(10). 492 - 499
    [viewed 06 December 2019]. Available from: https://publications.waset.org/pdf/10005536.