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New reconstruction of the sunspot group numbers since 1739 using direct calibration and "backbone" methods
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Title:
New reconstruction of the sunspot group numbers since 1739 using direct calibration and "backbone" methods

Authors:
Chatzistergos, Theodosios; Usoskin, Ilya G.; Kovaltsov, Gennady A.; Krivova, Natalie A.; Solanki, Sami K.

Publication:
Astronomy & Astrophysics, Volume 602, id.A69, 18 pp. (A&A Homepage)