Systematics of toroidal dipole modes in Ca, Ni, Zr, and Sn isotopes A. Repko, V. O. Nesterenko, J. Kvasil and P. -G. Reinhard Eur. Phys. J. A, 55 12 (2019) 242 Published online: 03 December 2019 DOI: 10.1140/epja/i2019-12770-x