1. The ground vegetation in upland spruce plantations in North Wales;Abdy;Asp. Appl. Biol.,1992
2. Long-term response of understorey vegetation to stand density in Picea-Tsuga forests;Alaback;Can. J. For. Res.,1988
3. Anderson, M.A., 1979. The development of plant habitats under exotic forest crops. In: Wright, S.E., Buckely, J.P. (Eds.), Ecology and Design in Amenity Land Management, Wye College, Recreation Ecology Research Group, pp. 87–105.
4. Anon, 1985. Advisory Soil Analysis and Interpretation, Bulletin 1 Macaulay Institute for Soil Research and the Council of the Scottish Agricultural Colleges.
5. Anon, 1986. The Analysis of Agricultural Materials, Reference Book 427, 3rd Ed. Agricultural Development and Advisory Services (ADAS)/Ministry of Agriculture Food and Fisheries (MAFF). HMSO, London, p. 162.