1. European Commission (EC), 2012. Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions. Innovating for Sustainable Growth: A Bioeconomy for Europe. COM (2012) 60. Brussels 13.02.2012
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 and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC
3. Energy from Renewable Sources Act, Bulgaria
4. Bringezu, S., S. Ramesohl, K. Arnold, M. Fischedick, J. von Geibler, C. Liedtke and H. Schütz, 2007. Towards a sustainable biomass strategy. What we know and what we should know. Wuppertal Paper no. 163, Wuppertal Institute for Climate, Environment and Energy.
5. European Commission, Directorate-General for Internal Market, Industry, Entrepreneurship and SMEs, Reichenbach, J., Essel, R., CASCADES : study on the optimised cascading use of wood, Mantau, U.(editor), Vis, M.(editor), Allen, B.(editor), Publications Office, 2016, https://data.europa.eu/doi/10.2873/827106