For how long will the current grand maximum of solar activity persist?

Abreu JA, Beer J, Steinhilber F, Tobias SM & Weiss NO
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Abreu, J. A., Beer, J., Steinhilber, F., Tobias, S. M., & Weiss, N. O. (2008). For how long will the current grand maximum of solar activity persist? Geophysical Research Letters, 35(20), 1-4. https://doi.org/10.1029/2008GL035442