A. S. Hariprasad, H. T. R. K. “Gauss Legendre Quadrature Formulas for Polygons Using an All Quadrilateral Finite Element Mesh of Triangular Surfaces”. International Journal of Engineering and Computer Science, vol. 3, no. 06, Dec. 2017, http://ijecs.in/index.php/ijecs/article/view/795.