Johannes Markkanen, Alex J. Yuffa, and Joshua A. Gordon. “Numerical Validation of a Boundary Element Method With Electric Field and Its Normal Derivative As the Boundary Unknowns”. The Applied Computational Electromagnetics Society Journal (ACES), vol. 34, no. 02, Feb. 2019, pp. 220-4, https://journals.riverpublishers.com/index.php/ACES/article/view/8605.