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Alonso, I, Hartley, S E and Thurlow, M (2001) Heather-grass competition on Scottish moorlands: interacting effects of nutrient enrichment and grazing regime. Journal of Vegetation Science, 12. pp. 249-260.
Turkington, Roy, John, Elizabeth, Krebs, C J, Dale, M R T, Nams, V O, Boonstra, R, Boutin, S, Martin, K, Sinclair, A R E and Smith, J N M (1998) The effects of NPK fertilisation for nine years on boreal forest vegetation in northwestern Canada. Journal of Vegetation Science, 9. pp. 333-346. ISSN 1100-9233