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Updated sunspot group number reconstruction for 1749–1996 using the active day fraction method

T. Willamo, I. G. Usoskin and G. A. Kovaltsov

A&A, 601 (2017) A109

Published online: 12 May 2017

DOI: 10.1051/0004-6361/201629839

T. Willamo

I. G. Usoskin

G. A. Kovaltsov

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