1. Bahn, P., Flenley, J., 1982. Easter Island, Earth Island, Book published by Thames and Hudson, London
2. Barkman, A., 1997. Applying the critical loads concept: Constraints induced by data uncertainty, Reports in Ecology and Environmental Engineering, vol. 1. ISSN 1104-2877/ISRN LUTKDH/TKKT-3012-SE Chemical Engineering, Lund University, pp. 1–121
3. Barkman, A., Sverdrup, H., 1996. Critical loads of acidity and nutrient imbalance for forest ecosystems in Skåne, Reports in Ecology and Environmental Engineering, vol. 1. ISSN 1104-2877/ISRN LUTKDH/TKKT-3009-SE Chemical Engineering, Lund University, pp. 1–67
4. Four tree species and the calcium, magnesium and potassium budgets of a Swedish forest site;Eriksson;New Zealand J. For.,1994
5. Uncertainty in prediction of weathering rate and environmental stress factors with the PROFILE model;Jönsson;Water, Air Soil Poll.,1995