Rui Ma, Xiangtuan Xiong & Mohammed Elmustafa Amin. (2021). The Method of Fundamental Solution for a Radially Symmetric Heat Conduction Problem with Variable Coefficient.
            <i>Journal of Partial Differential Equations</i>. <i>34</i> (3).
            258-267.
         doi:10.4208/jpde.v34.n3.4