1. European Parliament and Council. Directive 2001/77/EC on the promotion of electricity produced from renewable energy sources in the internal electricity market. Brussels, 2001.
2. IEA statistics—renewables information 2003,2003
3. European Parliament and Council. Directive 2003/30/EC on the promotion and use of biofuels or other renewable fuels for transport. Brussels, 2003.
4. Council of Ministries—The Republic of Poland. Development strategy of renewable energy sector. Warsaw, 2000.
5. A renewables-intensive global energy scenario (appendix to chapter 1);Johansson T,1993