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Usoskin, I. G.; Hulot, G.; Gallet, Y.; Roth, Raphael; Licht, A.; Joos, Fortunat; Kovaltsov, G. A.; Thébault, E.; Khokhlov, A. (2014). Evidence for distinct modes of solar activity. Astronomy and astrophysics, 562(L10), pp. 1-4. EDP Sciences 10.1051/0004-6361/201423391