Chen, H. ., Z. H. . Fan, R. S. . Chen, Z. N. . Jiang, and M. M. . Li. “Adaptive Mixed-Form Fast Multipole Method for the Analysis of Electromagnetic Scattering”. Applied Computational Electromagnetics Society Journal (ACES), vol. 25, no. 11, June 2022, pp. 962-74, https://journals.riverpublishers.com/index.php/ACES/article/view/15819.