J. D. Friedman, C. E. Johansson, N. Oskarsson, H. Svensson, S. Thorarinsson, R. S. Williams, Jr., Observations on Icelandic Polygon Surfaces and Palsa Areas. Photo Interpretation and Field Studies, Geografiska Annaler. Series A, Physical Geography, Vol. 53, No. 3/4 (1971), pp. 115-145
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Friedman et al. (1971) studied this question.
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