Higher-group structure in lattice Abelian gauge theory under instanton-sum modification Naoto Kan, Okuto Morikawa, Yuta Nagoya and Hiroki Wada Eur. Phys. J. C, 83 6 (2023) 481 Published online: 08 June 2023 DOI: 10.1140/epjc/s10052-023-11616-6