Solar cyclic activity over the last millennium reconstructed from annual 14C dataI. G. Usoskin, S. K. Solanki, N. A. Krivova, B. Hofer, G. A. Kovaltsov, L. Wacker, N. Brehm and B. KromerA&A, 649 (2021) A141DOI: https://doi.org/10.1051/0004-6361/202140711