1. Ahti, T., 1977. Lichens of the boreal coniferous zone. In: Seaward, M.R.D. (Ed.), Lichen Ecology. Academic Press, pp. 145–181.
2. Bryophytes and decaying wood, a comparison between a managed and a natural forest;Andersson;Holartic Ecology,1991
3. SAS Procedures Guide, Version 6,1990
4. Anon., 1993. Genstat 5: Release 3 Reference Manual. Lawes Agricultural Trust, Oxford Science Publications.
5. Anon., 1995. Biodiversity: the UK Steering Group Report, vol. 2 Action Plans, HMSO, London.