Note on Klein–Nishina effect in strong-field QED: the case of nonlinear Compton scattering U. Hernandez Acosta and B. Kämpfer Eur. Phys. J. D, 79 4 (2025) 36 Published online: 15 April 2025 DOI: 10.1140/epjd/s10053-025-00981-4