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J. M. Bullock, B. Clear Hill, M. P. Dale, J. Silvertown, An Experimental Study of the Effects of Sheep Grazing on Vegetation Change in a Species-Poor Grassland and the Role of Seedling Recruitment Into Gaps, Journal of Applied Ecology, Vol. 31, No. 3 (Aug., 1994), pp. 493-507
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Bullock et al. (1994) studied this question.
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