Xueying Zhang, James C. Newman III, Weiyang Lin, and W. Kyle Anderson. “Time-Dependent Adjoint Formulation for Metamaterial Optimization Using Petrov-Galerkin Methods”. Applied Computational Electromagnetics Society Journal (ACES), vol. 33, no. 02, July 2021, pp. 236-9, https://journals.riverpublishers.com/index.php/ACES/article/view/9303.