1. Impact of acid precipitation on forest and freshwater ecosystems in Norway;Abrahamsen,1976
2. Long-term acidification of a lake and resulting effects on fishes;Beamish;Ambio,1975
3. Air-borne acid;Brosset;Ambio,1973
4. Microbiology of aerial plant surfaces,1976
5. The movements of stomata;Heath,1969