High energy bremsstrahlung at the FCC-ee, FCC-eh and LHeC Krzysztof Piotrzkowski and Mariusz Przybycien Eur. Phys. J. C, 83 9 (2023) 802 Published online: 10 September 2023 DOI: 10.1140/epjc/s10052-023-11981-2