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Hegerl, Gabriele; Luterbacher, Jürg; González-Rouco, Fidel; Tett, Simon F.B.; Crowley, Thomas; Xoplaki, Elena (2011). Influence of human and natural forcing on European seasonal temperatures. Nature geoscience, 4(2), pp. 99-103. London: Nature Publishing Group 10.1038/ngeo1057
