Obi, A. ., R. . Lemdiasov, and R. . Ludwig. “Minimizing The 3D Solenoidal Basis Set in Method of Moments Based Volume Integral Equation”. Applied Computational Electromagnetics Society Journal (ACES), vol. 28, no. 10, Sept. 2021, pp. 903-8, https://journals.riverpublishers.com/index.php/ACES/article/view/11355.