Was one sunspot cycle in the 18th century really lost?

Krivova NA, Solanki SK & Beer J
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Krivova, N. A., Solanki, S. K., & Beer, J. (2002). Was one sunspot cycle in the 18th century really lost? Astronomy and Astrophysics, 396(1), 235-242. https://doi.org/10.1051/0004-6361:20021340