Magnetoelectric boundary simulated by a Chern–Simons-like model H. L. Oliveira, L. H. C. Borges, F. E. Barone and F. A. Barone Eur. Phys. J. C, 81 6 (2021) 558 Published online: 29 June 2021 DOI: 10.1140/epjc/s10052-021-09356-6