Observational appearance of Kaluza–Klein black holes Temurbek Mirzaev, Askar B. Abdikamalov, Ahmadjon A. Abdujabbarov, Dimitry Ayzenberg, Bobomurat Ahmedov and Cosimo Bambi Eur. Phys. J. C, 83 9 (2023) 800 Published online: 10 September 2023 DOI: 10.1140/epjc/s10052-023-11985-y