H. T. Rathod, M. Islam, B. Rathod, and K. S. Devi, “Finit element solution of Poisson Equation over Polygonal Domains using a novel auto mesh generation technique and an explicit integration scheme for linear convex quadrilaterals of cubic order Serendipity and Lagrange families”, int. jour. eng. com. sci, vol. 7, no. 01, pp. 23329–23482, Jan. 2018.