Impossibility of obtaining a CP-violating Euler–Heisenberg effective theory from a viable modification of QEDM Ghasemkhani, V Rahmanpour, R Bufalo and A SotoEur. Phys. J. C, 82 4 (2022) 376DOI: https://doi.org/10.1140/epjc/s10052-022-10351-8