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Sjögren, Per; van der Knaap, Willem Oscar; van Leeuwen, Jacqueline F. N. (2018). A practical approximation of pollen dispersal–deposition for calculation of pollen productivity and quantification of vegetation. Grana, 57(6), pp. 464-470. Scandinavian University Press 10.1080/00173134.2018.1485733
Sjögren, Per; van der Knaap, Willem Oscar; van Leeuwen, Jacqueline F.N. (2015). Pollen dispersal properties of Poaceae and Cyperaceae: First estimates of their absolute pollen productivities. Review of palaeobotany and palynology, 216, pp. 123-131. Elsevier 10.1016/j.revpalbo.2015.02.004
Sjögren, Per; Connor, Simon E.; van der Knaap, Willem Oscar (2010). The development of composite pollen-dispersal functions for estimating absolute pollen productivity in the Swiss Alps. Vegetation History and Archaeobotany, 19(4), pp. 341-349. Berlin: Springer 10.1007/s00334-010-0247-1
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
Sjögren, Per; van der Knaap, Willem Oscar; Kaplan, Jed O.; van Leeuwen, Jacqueline; Ammann, Brigitta (2008). A pilot study on pollen representation of mountain valley vegetation in the central Alps. Review of palaeobotany and palynology, 149(3-4), pp. 208-218. Amsterdam: Elsevier 10.1016/j.revpalbo.2007.12.006
Sjögren, Per; Lamentowicz, Mariusz (2008). Human and climatic impact on mires: a case study of Les Amburnex mire, Swiss Jura Mountains. Vegetation History and Archaeobotany, 17(2), pp. 185-197. Springer-Verlag 10.1007/s00334-007-0095-9
