1. 1) International Standard ISO 14040. Environmental management - life cycle assessment - principles and framework, ISO/TC207/SC5, (1997)
2. 2) J.B. Guinée, H.A. Udo de Haes, G. Huppes: Journal of Cleaner Production, 1, (1993), pp.3-13
3. 3) International Standard ISO 14044. Environmental management - life cycle assessment - Requirements and guidelines, ISO/TC207/SC5, (2006)
4. 4) R. Heijungs: Ecological Economics, 10, (1994), pp.69-81
5. 5) R. Heijungs, S. Suh: The Computational Structure of Life Cycle Assessment, Published by Kluwer Academic Publishers, The Netherlands, (2002)