1. International Energy Agency, IEA 2006. Available at 〈http://www.iea.org〉
2. Department of Energy, United Stated of America (DOE), 2006. Available at 〈http://www.eia.doe.gov〉
3. Kadellis JK, Chalvatzis KJ. Industrial development and the environment: sustainability and development, air pollution. Athens: Stamoulis Publications; 2005, ISBN: 960-351-589-2.
4. European Commission. Energy for the future: RES. White Paper for a Community Strategy and Action Plan, COM (97)599 final, 1997. p.49.
5. Energy planning and policy;Kleinpeter,1995