1. Applegate, H.G. and Durrant, L.C. (1969). Synergistic action of ozone: sulphur dioxide on peanut plants. Environmental Science and Technology, 3, 759–60.
2. Bache, B.W. (1983). The implications of rock weathering for acid neutralization. In Ecological Effects of Acid Deposition. Report PM 1636, pp. 175 - 87. National Swedish Environment Protection Board, Solna.
3. Battarbee, RW. (1989). The Acidification of Scottish Lochs and the Derivation of Critical Sulphur Loads from Palaeolimnological Data. Research Paper No. 36. Palaeoecology Research Unit, University College London.
4. Battarbee, RW., Anderson, N.J., Appleby, P.G., Flower, RJ., Fritz, S.C., Haworth, E.Y., Higgitt, S., Jones, V.J., Kreiser, A., Munro, M.A.R., Natkanski, J., Oldfield, F., Patrick, S.T., Richardson, N.G., Rippey, B. and Stevenson, A.C. (1988). Lake Acidification in the United Kingdom 1800–1986 — Evidence from Analysis of Lake Sediments. Palaeoecology Research Unit, University College London. HMSO, London.
5. Bell, J.N.B. (1982). Sulphur dioxide and the growth of grasses. In Effects of Gaseous Air Pollution in Agriculture and Horticulture (ed. by M.H. Unsworth and D.P. Ormrod ), pp. 225–46. Butterworth, London.