WASET
    R. Kongnuy and  E. Naowanich and  T. Kruehong,  The Global Stability Using Lyapunov Function.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    December 2012, vol. 72(12). 1659 - 1664
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/15304.