Zhang , WenzhongWang , Bo and Cai , Wei. (2023). Exponential Convergence Theory of the Multipole and Local Expansions for the 3-D Laplace Equation in Layered Media.
            <i>Annals of Applied Mathematics</i>. <i>39</i> (2).
            99-148.
         doi: 10.4208/aam.OA-2023-0005