Abdullah M. Algarni, Atef Z. Elsherbeni, and Mohammed Hadi. “Implementation of Passive and Active Circuit Elements in Cylindrical Finite-Difference Time-Domain Formulation”. The Applied Computational Electromagnetics Society Journal (ACES), vol. 35, no. 11, Nov. 2020, pp. 1420-1, https://journals.riverpublishers.com/index.php/ACES/article/view/7623.