C. S. Chen, Xinrong Jiang, Wen Chen & Guangming Yao. (2020). Fast Solution for Solving the Modified Helmholtz Equation with the Method of Fundamental Solutions.
            <i>Communications in Computational Physics</i>. <i>17</i> (3).
            867-886.
         doi:10.4208/cicp.181113.241014a