1. Singhofen, A.: Introduction into a Common Format for Life- Cycle Inventory Data, Status Report, SPOLD, Brussels (1996)
2. Grisel, L. andB. Weidema: Synthesis Report of Taormina Workshop on a Common Format for Life-Cycle Inventory Data, SPOLD, Brussels (1996)
3. Singhofen, A., C.R. Hemming, B.P. Weidema, L. Grisel, R. Bretz, B. de Smet, D. Russell: Development of a Common Format for Life-Cycle Inventory Data, Int. J. LCA 1 (3), 171–178 (1996)
4. Steen, B., R. Carlson, G. Löfcren: SPINE, A Relation Database Structure for Life Cycle Assessments, NEP (Nordic Project on Environmentally sound Product Development) 12/95, Göteborg(1995)
5. Boustead, I.: Eco-profiles of the European Plastics Industry, Reports 1-16, for The European Centre for Plastics in the Environment (PWMI) and other industry associations, APME, Brussels, (1992-1998)