1. Nitrogen productivity or photosynthesis minus respiration to calculate plant growth;Ågren;Oikos,1996
2. Theory and model or art and technology in ecology;Ågren;Ecol. Model.,1990
3. Ågren, G.I., Bosatta, E., 1998. Theoretical Ecosystem Ecology — Understanding Element Cycles. Cambridge, 245 pp.
4. Andersson, F, Ågren, G.I., Gobran, G.R., Hallbäcken, L., 1997. Critical points in forest ecosystem understanding determining the predictability of primary production. In: Führer, E., Berger, R. (Eds.), Proceedings of the 1st EFERN-Plenary meeting held on 19–22 October, 1996, in Vienna. Forstliche Schriftenreihe, Univ. f Bodenkultur, Wien, 10, pp. 5–18.
5. Andersson, F., Braekke, F., Hallbäcken, L. (Eds.), 1998. Nutrition and growth of Norway spruce forests in a Nordic climatic and deposition gradient, TemaNord 1998, 566, 254 pp.