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70 years of Sunspot Observations at Kanzelhöhe Observatory: systematic study of parameters affecting the derivation of the relative sunspot number
Pötzi, Werner; Veronig, Astrid M; Temmer, Manuela; Baumgartner, Dietmar; Freislich, Heinrich; et al. arXiv.org, Feb 24, 2016.You might have access to this document
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