1. Abrahamsen, G.: 1980, ‘Leaching of Plant Nutrients’, in D. Drablos and A. Tollan (eds.),Ecological impact of acid precipitation, Proc. Int. Conf. SNSF proj. Norway, pp. 196.
2. Aronsson, A. and Elowson, S.: 1980,Ecol. Bull. (Stockholm)32, 219–228.
3. Ashmore, M.: 1995, ‘Critical Levels for Forestry in Europe’, in H. Raitio and T. Kilponen (eds.)Critical Loads and Critical Limit Values, The Finnish Forest Research Institute, Research Papers 513, pp. 27–35.
4. Atlas of Finland: 1987,Appendix 131 Climate, National Board of Survey and Geographical Society of Finland, Helsinki, 31 pp.
5. Bache, D. H.: 1977,J. Appl. Ecol. 14, 881–895.