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Tonkov, Spassimir; Heiri, Oliver; Lotter, André (2022). 60. Peat bog Vodniza, Rila Mountains (Bulgaria). Grana, 61(4), pp. 307-309. Scandinavian University Press 10.1080/00173134.2022.2052954
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
Pokorný, Petr; van der Knaap, Willem Oscar (2011). 15. Brve (Czech Republic): Vegetation development over the last about 2.5 millennia in the Bohemian Lowland close to Prague. Grana, 50(4), pp. 311-313. Oslo: Scandinavian University Press 10.1080/00173134.2011.645551
Pokorný, Petr; van der Knaap, Willem Oscar (2010). Na Bahne (Czech Republic): Vegetation development over the last 2.5 millennia in the Eastern Bohemian lowland. Grana, 49(1), pp. 79-81. Oslo: Scandinavian University Press 10.1080/00173130903435846
Stefanova, Ivanka; van Leeuwen, Jacqueline; van der Knaap, Willem Oscar (2008). Contributions to the European Pollen Database - 2. Loch Laxford (north-west Scotland, UK). Grana, 47(1), pp. 78-79. Oslo: Scandinavian University Press 10.1080/00173130801987740
van Leeuwen, Jacqueline; van der Knaap, Willem Oscar (2008). Contributions to the European Pollen Database - 3. Fleck's Loch Bog (Foula, Shetland, Scotland, UK). Grana, 47(2), pp. 171-173. Oslo: Scandinavian University Press 10.1080/00173130802113809
Jankovska, Vlasta; Kunes, Petr; van der Knaap, Willem Oscar (2007). 1. Flaje-Kiefern (Krusne Hory Mountains): Late Glacial and Holocene vegetation development. Grana, 46(3), pp. 214-216. Oslo: Scandinavian University Press 10.1080/00173130701526341
