Abida Harbi,  Maximum Norm Analysis of a Nonmatching Grids Method for Nonlinear Elliptic Boundary Value Problem −Δu = f(u).   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2013, vol. 78(6). 1031 - 1036
    [viewed 20 February 2020]. Available from: https://publications.waset.org/pdf/7598.