1. Ångström, A., 1936. Soil temperature in forest stands of different crown density. Medd. Stat. Skogsförsöksanst. 29, 187–218, in Swedish with English summary
2. Bergh, J., 1997. Climatic and nutritional constraint to productivity in Norway spruce. Acta Universitatis Agriculturae Sueciae, Silvestria 37, p. 34. Ph.D. disseration. ISSN 1401-6230, ISBN 91-576-5321-6
3. Bergh, J., Linder, S., 1998. Effects of soil warming during spring on photosynthetic recovery in boreal Norway spruce stands. Global Change Biol., in press
4. Bergh, J., Linder, S., Lundmark, T., Elfving, B., 1998. The effect of water and nutrient availability on productivity of Norway spruce in northern and southern Sweden. For. Ecol. Manage., accepted
5. Physiological controls of the carbon balance of boreal forest ecosystems;Bonan;Can. J. For. Res.,1993