M. Llewellyn, R. Rashid, P. Leckstein, The Ecological Energetics of the Willow Aphid Tuberolachnus salignus (Gmelin); Honeydew Production, Journal of Animal Ecology, Vol. 43, No. 1 (Feb., 1974), pp. 19-29
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Llewellyn et al. (1974) studied this question.
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