Is there a planetary influence on solar activity?

Abreu JA, Beer J, Ferriz-Mas A, McCracken KG & Steinhilber F
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Abreu, J. A., Beer, J., Ferriz-Mas, A., McCracken, K. G., & Steinhilber, F. (2012). Is there a planetary influence on solar activity? Astronomy and Astrophysics, 548, A88 (9 pp.). https://doi.org/10.1051/0004-6361/201219997