Al-Harbi, Saleh M., and Alanod M. Sibih. “Boundary Integral Equation Modeling of 2D Functionally Graded Anisotropic Structures”. Journal of Materials Science Research and Reviews 2, no. 1 (December 8, 2018): 1-8. Accessed September 19, 2019. http://journaljmsrr.com/index.php/JMSRR/article/view/28818.