Raymond Hewson, Grazing by Mountain Hares Lepus timidus L., Red Deer Cervus elaphus L. and Red Grouse Lagopus l. scoticus on Heather Moorland in North-East Scotland, Journal of Applied Ecology, Vol. 13, No. 3 (Dec., 1976), pp. 657-666
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R. Hewson (1976) studied this question.
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