A 3.5 Mpc long radio relic in the galaxy cluster ClG 0217+70 D. N. Hoang, X. Zhang, C. Stuardi, T. W. Shimwell, A. Bonafede, M. Brüggen, G. Brunetti, A. Botteon, R. Cassano, F. de Gasperin et al. (7 more) A&A, 656 (2021) A154 Published online: 16 December 2021 DOI: 10.1051/0004-6361/202141428