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Sjögren, Per; van der Knaap, Willem Oscar; Huusko, Antti; van Leeuwen, Jacqueline (2008). Pollen productivity, dispersal, and correction factors for major tree taxa in the Swiss Alps based on pollen-trap results. Review of palaeobotany and palynology, 152(3-4), pp. 200-210. Amsterdam: Elsevier 10.1016/j.revpalbo.2008.05.003
