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Bütikofer, Rolf; Flückiger, Erwin O.; Desorgher, Laurent; Moser, Michael R.; Pirard, Benoît (2009). The solar cosmic ray ground-level enhancements on 20 January 2005 and 13 December 2006. Advances in space research, 43(4), pp. 499-503. Oxford: Pergamon 10.1016/j.asr.2008.08.001
