1. Cox, R. A. J. Photochem. 25, 43–48 (1984).
2. Cox, R. A. & Penkett, S. A. in Acid Deposition (eds Beilke, S. & Elshort, A. J.) 58–83 (CEC, Brussels, 1983).
3. UK Acid Rain Review Group Report (Warren Spring Laboratory, Stevenage, 1983).
4. Goldan, P. D. et al. Almos. Envir. 17, 1335–1364 (1983).
5. Grosjean. D. Anal. Lett. 15, (A9) 783–796 (1982).