Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE.
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Büntgen U, et al. Among authors: bernabei m.
Nat Commun. 2018 Sep 6;9(1):3605. doi: 10.1038/s41467-018-06036-0.
Nat Commun. 2018.
PMID: 30190505
Free PMC article.