1. A. Kicherer, H. Pfisterer, November 2000, BASF Aktiengesellschaft Publication, Ludwigshafen, Germany.
2. Finnish Ministry of Environment, August 2001, taken from http://www.vyh.fi/eng/research/cluster/backrou/Whatecoe.htm.
3. P. Saling, A. Kicherer, R. Wittlinger, Internat. J. Life Cycle Assess. 6 (2001) 1.
4. R. Landsiedel, P. Saling, Int. J. LCA 7 (2002) 261.
5. P. Saling, A. Kicherer, Internat. J. Life Cycle Assess. 7 (2002) 203.