1. Popper, K.R.: Logik der Forschung. 7. Auflage. J.C.B. Mohr (Paul Siebeck), Tübingen 1982 (1. Auflage: J. Springer, Wien 1934). 1st English edition: The Logic of Scientific Discovery. Hutchison, London 1959
2. Society of Environmental Toxicology and Chemistry (SETAC): Guidelines for Life Cycle Assessment: A“Code of Practice”. Edition 1. From the SETAC Workshop held at Sesimbra, Portugal, 31 March – 3 April 1993. Brussels, Belgium, and Pensacola, Florida, USA, August 1993
3. Stalmans, M.;Berenbold, H.;Berna, J.L.;Cavalli, L.;Dillar-Stone, A.;Franke, M.;Hirsinger, F.;Janzen, D.;Kosswig, K.;Postlethwaite, D.;Rappert, TH.;Renta, C;Scharer, D.;Schick, K.-P.;Schul, W.;Thomas, H.; vanSloten, R.: European Life-Cycle Inventory for Detergent Surfactants Production. Ten- side Surf. Det. 32 (1995) 84–109
4. Janzen, D.: Methodology of the European Surfactant LCI Study. Tenside Surf. Det. 32 (1995) 110–121
5. Klöpffer, W.;Grieghammer, R.;Sundström, G.: Overview of the Scientific Peer Review of the European Life Cycle Inventory for Surfactant Production. Tenside Surf. Det. 32 (1995) 378–383