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2. Shedding of older needle age classes does not necessarily reduce photosynthetic primary production of Norway spruce;Beyschlag;Trees,1994
3. Carter, C.I., 1977. Impact of green spruce aphid on growth: can a tree forget its past? Forestry Commission Res. Dev. Pap., 116, HMSO, London, 8 pp.
4. Carter, C.I., 1989. The 1989 outbreak of the green spruce aphid, Elatobium abietinum. Forestry Commission Res. Inf. Note, 161, Forestry Commission, Farnham, 2 pp.
5. Carter, C.I., 1995. The green spruce aphid, spruce root aphids and tree growth in Afan Forest. In: Coutts, M.P. (Ed.), Decline in Sitka Spruce on the South Wales Coalfield, Forestry Commission Tech. Pap., 9, Forestry Commission, Edinburgh, pp. 95–103.