1. Acid precipitation, plant nutrients and forest growth;Abrahamsen,1980
2. Effects of acid precipitation on coniferous forest;Abrahamsen,1976
3. Impacts of acid precipitation on coniferous forest ecosystems;Abrahamsen;Water Air Soil Pollut.,1977
4. Chemical Analysis of Ecological Materials;Allen,1974
5. Effects of acidification on Swedish lakes;Almer;Ambio,1974