1. Life-Cycle Assessment;Udo de Haes,1992
2. ‘A Technical Framework for Life-Cycle Assessment’, Workshop report,1991
3. Methodik für Oekobilanzen auf der Basis ökologischer Optimierung;Ahbe,1990
4. ‘Life-Cycle Assessment’, Workshop report;Annema,1992
5. Integrated Substance Chain Management;McKinsey & Company, Inc.,1991