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Brehm, Nicolas; Christl, Marcus; Knowles, Timothy D J; Casanova, Emmanuelle; Evershed, Richard P; Adolphi, Florian; Muscheler, Raimund; Synal, Hans-Arno; Mekhaldi, Florian; Paleari, Chiara I; Leuschner, Hanns-Hubert; Bayliss, Alex; Nicolussi, Kurt; Pichler, Thomas; Schlüchter, Christian; Pearson, Charlotte L; Salzer, Matthew W; Fonti, Patrick; Nievergelt, Daniel; Hantemirov, Rashit; ... (2022). Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE. Nature Communications, 13(1), p. 1196. Springer Nature 10.1038/s41467-022-28804-9
