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Graham, N.E.; Ammann, C.M.; Fleitmann, D.; Cobb, K.M.; Luterbacher, Jürg (2011). Support for global climate reorganization during the “Medieval Climate Anomaly”. Climate dynamics, 37(5-6), pp. 1217-1245. Heidelberg: Springer 10.1007/s00382-010-0914-z
