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

Author： Willamo T.   Usoskin I. G.   Kovaltsov G. A.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|601|issue|A109-A109

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.601, Iss.issue, 2017-05, pp. : A109-A109

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