Euclid : Effects of sample covariance on the number counts of galaxy clusters A. Fumagalli, A. Saro, S. Borgani, T. Castro, M. Costanzi, P. Monaco, E. Munari, E. Sefusatti, A. Amara, N. Auricchio et al. (86 more) A&A, 652 (2021) A21 Published online: 03 August 2021 DOI: 10.1051/0004-6361/202140592