1. Bengtsson M (2000): Environmental Valuation and Life Cycle Assessment. Göteborg: Chalmers University of Technology
2. Brand G, Scheidegger A, Schwank O, Braunschweig A (1998): Bewertung in ökobilanzen mit der Methode der ökologischen Knappheit — ökofaktoren 1997; BUWAL Schriftenreihe Umwelt Nr. 297, Bern
3. Ciroth A (2002): Monte Carlo Simulation in the interpretation step of a Life Cycle Assessment, platform presentation SETAC Annual Meeting, Vienna, 14 May 2002
4. Clift R (2001): Industrial ecology and material chain management, key lecture, 11th Annual Meeting of SETAC Europe, Madrid, 9 May 2001
5. Ecosite (2002) http://www.ecosite.co.uk/depart/sandm.html