“An Adaptive Finite Element Method with a Modified Perfectly Matched Layer Formulation for Diffraction Gratings”, Commun. Comput. Phys., vol. 6, no. 2, pp. 290–318, Mar. 2018, Accessed: Dec. 06, 2025. [Online]. Available: https://global-sci.com/index.php/cicp/article/view/7440