“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”. 2018.
International Journal of Engineering and Computer Science 7 (01): 23329-482.
http://ijecs.in/index.php/ijecs/article/view/3938.