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Иш: 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
Мақола19982 иқтибосABIUncertainties in the Sunspot Numbers: Estimation and Implications
T. Dudok de Wit, Laure Lefèvre, F. Clette
Мақола20162 иқтибосABI