1. Berg, A., Skre, O., Wielgolaski, F.E., Kjelvik, S.: Leaf areas and angles, chlorophyll and reserve carbon in alpine and sub-alpine plant communities, Hardangervidda, Norway. In: Bliss, L.C., Wielgolaski, F.E. (Eds.): Primary production and production processes, Tundra Biome, pp.239–254. Edmonton-Oslo: IBP Tundra Biome Steering Committee 1973.
2. Caldwell, M.M., Tieszen, L. L.,Fareed, M.: Comparative Barrow and Niwot Ridge canopy structure. In: Bowen, S. (Ed.): Proceedings U.S. 1972 Tundra Biome Symposium, pp.22–28. Hannover-New Hampshire: USA CRREL 1972.
3. Dennis, J.G., Tieszen, L.L.: Seasonal course of dry matter and chlorophyll by species at Barrow, Alaska. In:Bowen, S. (Ed.): Proceedings 1972 U.S. Tundra Biome Symposium, pp.16–21. Hannover-New Hampshire: USA CRREL 1972.
4. Hinneri, S., Sonesson, M., Veum, A.K.: Soils of Fennoscandian IBP tundra ecosystems. In: Wielgolaski, F. E. (Ed.): Fennoscandian tundra ecosystems, Part 1: Plants and microorganisms, pp. 31–40. Berlin-Heidelberg-New York: Springer 1975.
5. Kjelvik, S.: Måling av bladareal ved hjelp av lys ved IBP’s primeerproduksjonsundersøkelser pa Hardangervidda. IBP i Norden 8, 87–90 (1972).