1. 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;The European Parliament,2009
2. Press release- Energy Union: secure, sustainable, competitive, affordable energy for every European;European Commission;Eur. Comm.,2015
3. The future of anaerobic digestion and biogas utilization;Holm-Nielsen;BioresourceTechnology,2009
4. Supply, Transformation and Consumption of Renewable Energies - Annual Data [nrg_107a];Eurostat,2015
5. Biogas Barometer 2014;EurObserv’ER,2014