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Soepboer, Welmoed; Sugita, Shinya; Lotter, André F.; van Leeuwen, Jacqueline F. N.; van der Knaap, Willem Oscar (2007). Pollen productivity estimates for quantitative reconstruction of vegetation cover on the Swiss Plateau. Holocene, 17(1), pp. 65-77. Los Angeles, Calif.: Sage 10.1177/0959683607073279
