Usoskin, Ilya G. и др. A Millennium Scale Sunspot Number Reconstruction: Evidence For an Unusually Active Sun Since the 1940's // Physical Review Letters 91 (21). 2003. DOI:10.1103/PhysRevLett.91.211101. с. 211101.
Luthardt, Ludwig и др. Fossil forest reveals sunspot activity in the early Permian // Geology 45 (2). февруари 2017. DOI:10.1130/G38669.1. с. 279.
Li, Pengbo. Sunspot cycles recorded in siliciclastic biolaminites at the dawn of the Neoproterozoic Sturtian glaciation in South China // Precambrian Research 315. септември 2018. DOI:10.1016/j.precamres.2018.07.018. с. 75 – 91.
Celia Martin-Puertas, Katja Matthes, Achim Brauer, Raimund Muscheler, Felicitas Hansen, Christof Petrick, Ala Aldahan, Göran Possnert & Bas van Geel. Regional atmospheric circulation shifts induced by a grand solar minimum // Nature Geoscience 5 (6). 2 април 2012. DOI:10.1038/ngeo1460. с. 397 – 401.
Usoskin, I. G. и др. A solar cycle lost in 1793 – 1800: Early sunspot observations resolve the old mystery // The Astrophysical Journal 700 (2). 2009. DOI:10.1088/0004-637X/700/2/L154. с. L154.
livingreviews.org
solarphysics.livingreviews.org
David H. Hathaway, "The Solar Cycle", Living Reviews in Solar Physics, March 2010, Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany. ISSN 1614 – 4961
