Moroccan speleothem and tree ring records suggest a variable positive state of the North Atlantic Oscillation during the Medieval Warm Period - Wassenburg, Jasper; Immenhauser, A.; Richter, D. K.; Niedermayr, A.; Riechelmann, S.; Fietzke, J.; Scholz, Denis; Jochum, K. P.; Fohlmeister, Jens; Schröder-Ritzrau, Andrea; Sabaoui, A.; Riechelmann, Dana; et al. (Earth and planetary science letters, 2013)
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