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Robyn V. Jackson, Johannes Kollmann, Peter J. Grubb, Jennie N. Bee, Insect Herbivory on European Tall-Shrub Species: The Need to Distinguish Leaves before and after Unfolding or Unrolling, and the Advantage of Longitudinal Sampling, Oikos, Vol. 87, No. 3 (Dec., 1999), pp. 561-570
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Jackson et al. (1999) studied this question.
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