1. Wieler R, Beer J, Leya I (2011) The galactic cosmic ray intensity over the past 106–109 years as recorded by cosmogenic nuclides in meteorites and terrestrial samples. Space Sci Rev. doi: 10.1007/s11214-011-9769-9
2. Lifton NA, Bieber JW, Clem JM, Duldig ML, Evenson P, Humble JE, Pyle R (2005) Addressing solar modulation and long-term uncertainties in scaling secondary cosmic rays for in situ cosmogenic nuclide applications. Earth Planet Sci Lett 239:140–161
3. Usoskin IG, Solanki SK, Taricco C, Bhandari N, Kovaltsov GA (2006a) Long-term solar activity reconstructions: direct test by cosmogenic 44Ti in meteorites. Astron Astrophys 457:L25–L28
4. Usoskin IG (2008) A history of solar activity over millennia. www.livingreviews.org/lrsp-2008
5. Muscheler R, Beer J, Kubik PW (2004) Long-term solar variability and climate change based on radionuclide data from ice cores. In Pap JM, Fox P (eds) Solar variability and its effects on climate. AGU, Washington DC