1. ISO 14040 Environmental management—Life cycle assessment—Principles and framework: International Organisation for Standardisation, Geneva, Switzerland; 1998.
2. Life Cycle Assessment: Inventory Guidelines and Principles;Vigon,1993
3. A Technical Framework for Life-Cycle Assessment;Fava,1991
4. Guidelines for Life-Cycle Assessment: A ‘Code of Practice’;Consoli,1993
5. Nordic Guidelines on Life-Cycle Assessment, Nord 1995:20;Lindfors,1995