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A. J. Southward, D. J. Crisp, Recent Changes in the Distribution of the Intertidal Barnacles Chthamalus stellatus Poli and Balanus balanoides L. in the British Isles, Journal of Animal Ecology, Vol. 23, No. 1 (May, 1954), pp. 163-177
Southward et al. (Sat,) studied this question.
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