Khaled Moaddy,  A Non-Standard Finite Difference Scheme for the Solution of Laplace Equation with Dirichlet Boundary Conditions.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2020, vol. 162(6). 53 - 56
    [viewed 07 August 2020]. Available from: https://publications.waset.org/pdf/10011280.