1. U.S. Nuclear Regulatory Commission. Reactor safety study. NUREG 75/014, ex-WASH 1400, 1975
2. Society of Environmental Toxicology and Chemistry. A technical framework for life-cycle assessment, 1991
3. Stahel W.R. Long-life system utilization: new strategies of product design, marketing and risk management for waste prevention, Proc. intern, con. on innovation, industrial progress and environment. FEANI, 1991, pp. 25-33
4. Schmidt-Bleek F. Wieviel Umwelt braucht der Mensch? Backhaus, Wuppertal, Germany, 1994.
5. Nebbia G. Proposta di una rappresentazione input/output dei flussi di materia nella biosfera e nella tecnosfera. AIS meeting on statistics for environmental Management. Roma, 1996.