“A New Directional Algebraic Fast Multipole Method Based Iterative Solver for the Lippmann-Schwinger Equation Accelerated With HODLR Preconditioner”. Communications in Computational Physics 32, no. 4 (October 28, 2022): 1061–1093. Accessed March 4, 2026. https://www.global-sci.com/cicp/article/view/7109.