1. Climate Change and Sustainability in Europe. Policy Note 2001–2003;Alfsen,2001
2. Environmental factors and ecological processes in boreal forests;Bonan;Annu. Rev. Ecol. Syst.,1989
3. Skogskjøtsel I. Skogøkologi;Børset,1985
4. The effect of cone crops on growth in Norway spruce (Picea abies (L.) Karst);Chalupka;Arboretum Kornickie,1975
5. Effekter av tørke og nitrogen;Christiansen;Aktuelt fra Skogforsk,1990