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van der Knaap, Willem Oscar; van Leeuwen, Jacqueline F. N.; Svitavská-Svobodová, H.; Pidek, I.A.; Kvavadze, E.; Chichinadze, M.; Giesecke, T.; Kaszewsk, B.M.; Oberli, F.; Kalniņa, L.; Pardoe, H.S.; Tinner, Willy; Ammann, Brigitta (2010). Annual pollen traps reveal the complexity of climatic control on pollen productivity in Europe and the Caucasus. Vegetation History and Archaeobotany, 19(4), pp. 285-307. Berlin: Springer-Verlag 10.1007/s00334-010-0250-6
