R. Turkington, M. A. Cahn, A. Vardy, J. L. Harper, The Growth, Distribution and Neighbour Relationships of Trifolium Repens in a Permanent Pasture: III. The Establishment and Growth of Trifolium Repens in Natural and Perturbed Sites, Journal of Ecology, Vol. 67, No. 1 (Mar., 1979), pp. 231-243
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Turkington et al. (1979) studied this question.