Testing non-local gravity by clusters of galaxies Filippo Bouchè, Salvatore Capozziello, Vincenzo Salzano and Keiichi Umetsu Eur. Phys. J. C, 82 7 (2022) 652 Published online: 27 July 2022 DOI: 10.1140/epjc/s10052-022-10586-5