1. Sweden's case to the U. N. Conf. on the Human Environment (Royal Ministry of Foreign Affairs, Stockholm, 1971).
2. Leivestad, H., Hendrey, G., Muniz, I. P. & Snekvik, E. in SNSF Report FR6/76 (ed. Braekke, F. H.) 87–111 (SNSF, Oslo 1976).
3. Muniz, I. P. & Leivestad, H. in Ecological Imapct of Acid Precipitation (eds Drabløs, D. & Tollan, A.) 84–92 (SNSF, Oslo, 1980).
4. Harvey, H. H. in Ecological Impact of Acid Precipitation, (eds Drabløs, D. & Tollan, A.) 93–98 (SNSF, Oslo, 1980).
5. Harriman, R. & Morrison, B. in Ecological Impact of Acid Precipitation (eds Drabløs, D. & Tollan, A.) 312–313 (SNSF, Oslo, 1980).