1. Sulphur pollution: Ca, Mg and Al in soil and soil water and possible effects on forest trees;Abrahamsen,1983
2. Comparisons of forest soils in relation to acid precipitation in Central Norway, South Norway and Schwarzwald in West Germany;Aune;Rep. Norweg. For. Res. Inst.,1989
3. Comment on ‘Regional hydrochemistry of North America carbonate terrains’ by Russel S. Harmon, William B. White, John J. Drake and John W. Hess and ‘The effects of climate on the chemistry of carbonate groundwater’ by John J. Drake and T.M.L. Wingley;Brook,1977
4. A model of streamwater chemistry at Birkenes, Norway;Christophersen;Water Resour. Res.,1982
5. Testing a soil-oriented charge balance equilibrium model for freshwater acidification;Christophersen,1987