1. Cronan, C.: 1984, ?Biogeochemical Responses of Forest Canopies to Acid Precipitation?, in R. Linthurst (eds.), Acid Precip. Series, No. 5, Butterworth Publ. Stoneham, U.S.A.
2. Dollard, G. J., Unsworth, M. H., and Harve, M. J.: 1983, Nature 302, 241.
3. Fowler, D., Cape, I. N., Jost, D., and Beilke, S.: 1985, Pollution Environment in Non-Nordic Europe, Abstracts, International Symposium on Acidic Precipitation, Muskoka, September 15?20.
4. Georgii, H.-W., Rohbock, E., and Perseke, C.: 1983, ?Investigation of the Wet and Dry Deposition of Acidic and Heavy-Metal Components?, in H. Off and H. Strangl (eds.), Acid Deposition ? a Challenge for Europe, Karlsruhe September 19?21, 1983, Commission of the European Communities.
5. Horntvedt, R.: 1975, Kjemisk inhold i nedbør under traer, Et litteratursammendrag, Tekniskt notat, sur nedbørs virkning på skog og fisk, Sekretariatet, Ås-NLH, Nørge.