1. CEN, 2003. CEN-TS 14588. Technical Specification: Solid Biofuels-Terminology, Definitions and Descriptions.
2. CEN, 2009. CEN-TS 14775:2009. Technical Specification: Solid biofuels. Determination of ash content.
3. CEN, 2010a. CEN-TS 14961–1:2010. Technical Specification: Solid biofuels. Fuel specifications and classes. Part 1: General requirements.
4. CEN, 2010b. CEN-TS 14961–1:2010. Technical Specification: Solid biofuels. Fuel specifications and clases. Part 3: Wood briquettes for non-industrial use.
5. CEN, 2011a. CEN-TS 15104:2011. Technical Specification: Solid biofuels. Determination of total content of carbon, hydrogen and nitrogen. Instrumental methods.