1. Agestam, E., 1985. A growth simulator for mixed stands of pine, spruce and birch in Sweden. Department of Forest Yield Research, Swedish University of Agricultural Sciences. Report 15, p. 150 (in Swedish with English summary).
2. Mixed forests as a part of sustainable forestry in southern Sweden;Agestam;Journal of Sustainable Forestry,2005
3. Über Waldtypen;Cajander;Acta Forestalia Fennica,1909
4. The Ecology of Mixed-species Stands of Trees. Special Publication of the British Ecological Society;Cannel,1992
5. The functional role of producer diversity in ecosystems;Cardinale;American Journal of Botany,2011