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21 ta ish
Ish: Historical solar observations archive at the Ulugh Beg Astronomical Institute (Tashkent): catalogue of monthly averaged sunspot activity indices (1932–2000)
Group Sunspot Numbers: A New Solar Activity Reconstruction
Douglas V. Hoyt, Kenneth H. Schatten
Maqola19982 iqtibosABIUncertainties in the Sunspot Numbers: Estimation and Implications
T. Dudok de Wit, Laure Lefèvre, F. Clette
Maqola20162 iqtibosABI