Zurita-Sánchez, J. R. “Quasi-Static Electromagnetic Fields Created by an Electric Dipole in the Vicinity of a Dielectric Sphere: Method of Images”. Revista Mexicana De Física, vol. 55, no. 6, Jan. 2009, pp. 443-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3714.