1. Estonia's Fifth National Communication under the UN Framework Convention on Climate Change. Estonia; December 2009. www.unfccc.int.
2. Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources;Official Journal,2009
3. Directive 2009/31/EC of the European Parliament and of the Council of 23 April 2009 on the geological storage of carbon dioxide;Official Journal,2009
4. Decision No 406/2009/EC of the European Parliament and of the Council of 23 April 2009 on the effort of Member States to reduce their greenhouse gas emissions to meet the Community's greenhouse gas emission reduction commitments up to 2020;Official Journal,2009