1. Albritton, D., R. Derwent, I. Isaksen, M. Lal &D. Wuebblk (1996): Trace gas radiative forcing indices. In:Houghton, J.T., L.G. Meira Filho, B.A. Callander, N. Harris, A. Kattenberg &K. Maskell. Climate change 1995: the science of climate change. University Press, Cambridge, London, UK
2. Andersson-Sköld, Y., P. Grennfelt &K. Pleijel (1992): Photochemical ozone creation potentials: a study of different concepts. J. Air Waste Manage. Assoc. 42 (9): 1152–1158
3. Beccali, G., M. Beccali amp:M. Cellura (1997): Fuzzy set application in life cycle inventory of building materials. Paper. Building and the Environment: Proceedings of the Second International Conference. Volume 1: Assessment methods and natural resources. Centre Scientifique et Technique du Bâtiment, Paris, France
4. Boustead, I. (1993): Eco-profiles of the European plastics industry. Report 3: polyethylene and polypropylene. A report for the European Centre for Plastics in the Environment (PWMI), Brussels, Belgium
5. Bretz, R. &P. Frankhauser (1996): Screening LCA for large number of products: estimation tools to fill data gaps. Int. J. LCA 1 (3): 139–146