1. Brundtland G et al. (1987) Our common future (\’brundtland report\’)
2. OECD, Material Resources, Productivity and the Environment. OECD Publishing
3. O’Sullivan A, Sheffrin SM, Perez SJ (2008) Urban economics, 8th edn. Pearson Education, Upper Saddle River
4. I.S. Analysis (2015) (ed) What are the products and uses of petroleum?
5. Rübberdt K (2012) New natural resource base in the chemical industry—only a matter of time. Achema