1. Environmental resource guide,1996
2. Sjöberg A, Ekvall T, Ölund G. LCA in the environmental management system at Perstorp flooring. In: Proceedings of the 5th LCA Case Studies Symposium SETAC-Europe, 1997:61–7.
3. Life Cycle Assessment study on resilient floor coverings;Günther;The International Journal of Life Cycle Assessment,1997
4. Life Cycle Assessment of four types of floor covering;Potting;Journal of Cleaner Production,1995
5. Assopiastrelle, Centro Ceramico Bologna, Istituto di Economia delle Fonti di Energia e dell'Ambiente dell'Università Bocconi. Environment, Hygiene, Security. EdiCer spa; 1997 [in Italian].