Confinement in spherical and cylindrical toroids: A—Electrons in quantum dots B—Electromagnetic multipole sources and fieldsEugenio Ley-Koo and Humberto Torres-BustamanteEur. Phys. J. D, 75 4 (2021) 120DOI: https://doi.org/10.1140/epjd/s10053-021-00131-6