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Beer, J.; Blinov, A.; Bonani, G.; Finkel, R. C.; Hofmann, H. J.; Lehmann, B.; Oeschger, H.; Sigg, A.; Schwander, J.; Staffelbach, T.; Stauffer, B.; Suter, M.; Wölfli, W. (1990). Use of 10Be in polar ice to trace the 11-year cycle of solar activity. Nature, 347(6289), pp. 164-166. Nature Publishing Group 10.1038/347164a0
