W. O. van der Knaap, Past Vegetation and Reindeer on Edgeoya (Spitsbergen) Between c. 7900 and c. 3800 BP, Studied by Means of Peat Layers and Reindeer Faecal Pellets, Journal of Biogeography, Vol. 16, No. 4 (Jul., 1989), pp. 379-394
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W. O. van der Knaap (1989) studied this question.