1. Global Forest Resources Assessment. Progress towards sustainable forest management;FAO,2005
2. Forests and energy. Key issues;FAO,2008
3. Bioenergy in Europe. Implementation of EU Directives and policies relating to bioenergy in Europe and RD&D Priorities for the future;Sipilä,2008
4. Sustainability criteria and certification systems for biomass production. Final report;Vis,2008
5. Steps towards the development of a certification system for sustianable bio-energy trade;Lewandowski;Biomass Bioenergy,2006