A New Calibrated Sunspot Group Series Since 1749: Statistics of Active Day Fractions
Journal article published in 2016 by
I. G. Usoskin,
G. A. Kovaltsov,
M. Lockwood 
,
K. Mursula,
M. Owens,
S. K. Solanki
,
K. Mursula,
M. Owens,
S. K. Solanki
This paper is available in a repository.
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