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Steinhilber, F.; Abreu, J.A.; Beer, J.; Brunner, I.; Christl, M.; Fischer, H.; Heikkilä, U.; Kubik, P.W.; Mann, M.; McCracken, K.G.; Miller, H.; Miyahara, H.; Oerter, H.; Wilhelms, F. (2012). 9,400 years of cosmic radiation and solar activity from ice cores and tree rings. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 109(16), pp. 5967-5971. Washington, D.C.: National Academy of Sciences NAS 10.1073/pnas.1118965109
