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T. Podladchikova, R. Van der Linden, 2012: "A Kalman Filter Technique for Improving Medium-Term Predictions of the Sunspot Number". Solar Physics. DOI: 10.1007/s11207-011-9899-y https://link.springer.com/article/10.1007/s11207-011-9899-y
For any scientific use please refer to this paper
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