1. Forest limit development in Norway, with special regard to the 20th century;Aas;Arkeologisk museum I Stavanger – Varia,1995
2. The Impacts of Climate Variability on Forests,1998
3. Increase of Indian Summer monsoon rainfall on the Tibetan Plateau recorded by tree rings;Bräuning;Geophysical Research Letters,2004
4. Callaghan, T., Sømme, L., Sonesson, M., 1993. Impacts of Climate Change at High Latitudes on Terrestrial Plant and Invertebrates. Research Report for the DN. Trondheim, 67pp.
5. Modelling the possible impact of climate change on broad-scale vegetation structure. Examples from northern Europe;Cramer,1997