Ley Koo, E., Torres-Bustamante, H. and Góngora T., A. (2021) “Spherical symmetry breaking in electric, magnetic and toroidal multipole moment radiations in spherical toroidal resonant cavities and optimum-efficiency antennas”, Revista Mexicana de Física, 67(2 Mar-Apr), pp. 174–179. doi: 10.31349/RevMexFis.67.174.