1. Statistical review of world energy 2013;BP,2013
2. Electricity and natural gas prices for industrial consumers;EUROSTAT,2013
3. The global biomass market outlook current status, key players, growth potential, and the future outlook;Business Insights,2011
4. Wood fuel price statistics in Europe. Solutions for biomass fuel market barriers and raw material availability;Vinternback,2011
5. Global biomass pricing, economics and key subsidy schemes in Europe & Asia;Govan,2012