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T. R. E. Southwood, Interactions of Plants and Animals: Patterns and Processes, Oikos, Vol. 44, No. 1, Plant-Animal Interactions. Proceedings of the Third European Ecological Symposium. Lund, 22-26, August 1983 (Mar., 1985), pp. 5-11
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T. R. E. Southwood (1985) studied this question.
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