1. Nitrogen production or photosynthesis minus respiration to calculate plant growth;Ågren;Oikos,1996
2. Ågren, G.I., Bosatta, E., 1996. Theoretical Ecosystem Ecology — Understanding Element Cycles. Cambridge University Press, 234 pp.
3. Critical points in forest ecosystem understanding determining the predictability of primary production. In: Proceedings of the first EFERN Plenary Meeting, Vienna;Andersson;Forstl. Schriftenreihe Univ. Bodenkultur, Wien,1997
4. Sustainable tree biomass production;Andersson;Forest Ecology and Management,2000
5. Anon., 1983a. Il bosco svizzero. Dono svizzero della festa nazionale, Federal Bureau of Forestry, Bern, 48 pp.