Guang Zeng and  Jin Huang and  Zicai Li,  Heuristic Method for Judging the Computational Stability of the Difference Schemes of the Biharmonic Equation.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2010, vol. 37(1). 113 - 115
    [viewed 22 October 2019]. Available from: https://publications.waset.org/pdf/1081.