A. S. Hariprasad, H. T. Rathod, K.V.Vijayakumar,. 2017. “Gauss Legendre Quadrature Formulas for Polygons Using an All Quadrilateral Finite Element Mesh of Triangular Surfaces”. International Journal of Engineering and Computer Science 3 (06). india. http://ijecs.in/index.php/ijecs/article/view/795.