Key points are not available for this paper at this time.
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
Bullock et al. (Mon,) studied this question.