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P. Barclay-Estrup, C. H. Gimingham, The Description and Interpretation of Cyclical Processes in a Heath Community: I. Vegetational Change in Relation to the Calluna Cycle, Journal of Ecology, Vol. 57, No. 3 (Nov., 1969), pp. 737-758
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Barclay-Estrup et al. (1969) studied this question.
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