Induced CP-violation in the Euler–Heisenberg Lagrangian M. Ghasemkhani, V. Rahmanpour, R. Bufalo, M. N. Mnatsakanova and A. Soto Eur. Phys. J. C, 83 1 (2023) 39 Published online: 19 January 2023 DOI: 10.1140/epjc/s10052-022-11145-8