From the Wolf number to the International Sunspot Index: 25 years of SIDC

By F. Clette, D. Berghmans, P. Vanlommel, R. V. D. Linden, A. Koeckelenbergh, L. Wauters. 2007

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A History of Solar Activity over Millennia (2008, methodology): “Since then, the sunspot number series is routinely updated as the International sunspot number Ri, provided by the Solar Influences Data Analysis Center in Belgium (Clette et al., 2007).”
The New Sunspot Number: Assembling All Corrections (2015, methodology): “In contrast, we know that in the course of his career, Wolf used several instruments at different times, and he only progressively established and refined the determination of the personal coefficients k (Kopecky, Ruzickova-Topolova, and Kuklin, 1980; Clette et al., 2014).”
A Revised Collection of Sunspot Group Numbers (2016, methodology): “This database includes all observations collected on a monthly basis from the worldwide network coordinated by the WDC–SILSO, for a current total of more than 530,000 individual daily observations.”
A History of Solar Activity over Millennia (2008, unknown): “Since then, the sunspot number series is routinely updated as the International sunspot number Ri, provided by the Solar Influences Data Analysis Center in Belgium (Clette et al., 2007).”